Tag: science

Webb snaps infrared picture of Uranus

10:11 am

Uranus as seen in the infrared by Webb
Click for original Webb false-color image.

In a follow-up to a recent Hubble Space Telescope optical image of Uranus, scientists have now used the Webb Space Telescope to take a comparable picture in the infrared of the gas giant.

Both pictures are to the right, with the Webb picture at the top including the scientists’ annotations.

On the right side of the planet there’s an area of brightening at the pole facing the Sun, known as a polar cap. This polar cap is unique to Uranus – it seems to appear when the pole enters direct sunlight in the summer and vanish in the fall; these Webb data will help scientists understand the currently mysterious mechanism. Webb revealed a surprising aspect of the polar cap: a subtle enhanced brightening at the center of the cap. The sensitivity and longer wavelengths of Webb’s NIRCam may be why we can see this enhanced Uranus polar feature when it has not been seen as clearly with other powerful telescopes like the Hubble Space Telescope and Keck Observatory.

At the edge of the polar cap lies a bright cloud as well as a few fainter extended features just beyond the cap’s edge, and a second very bright cloud is seen at the planet’s left limb. Such clouds are typical for Uranus in infrared wavelengths, and likely are connected to storm activity.

The Webb image also captures 11 of Uranus’s 13 rings, which appear much brighter in the infrared than in the optical.

Unlike all other planets in the solar system, Uranus’s rotation is tilted so much that it actually rolls as it orbits the Sun, a motion that is obvious by comparing these pictures with Hubble’s 2014 optical picture.

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Exploring the cratered southern highlands of Mars, part 1

12:06 pm

Overview map of southern cratered highlands of Mars

Glacial filled crater
Click for original image.

Today and for the next three days the cool images that I will post from Mars will explore a region that I have not covered very much in depth, the cratered southern highlands between the giant basins Argyre and Hellas. The map above is an overview of this 7,000-mile-long region, all of which is inside the 30 to 60 degree south latitude band where scientists have found much evidence of buried glaciers. In this region the bulk of that evidence is most obvious inside craters.

The picture to the right, cropped, reduced, and sharpened to post here, was taken on December 21, 2022 by the high resolution camera on Mars Reconnaissance Orbiter (MRO), and shows a typical example of the kind of glacial feature found. The white cross on the map marks its location, west of the Hellespontus Mountains that form the western rim of Hellas Basin.

Scientists have dubbed this feature concentric crater fill, a purposely vague term because — though it looks like glacial fill — until there is data to confirm it the scientists would quite properly rather not commit themselves. The concentric rings suggest multiple layers, each of which likely marks a different climate cycle in Mars’ geological history.

In this case the glacier features also appear to cover the entire plain surrounding the crater as well as its rim. The small crater to the west is similar, and both give the appearance that the ice sheet that covers them came after the impact, draping itself over everything, with the craters only visible because the ice sheet sags within their interiors.

More crazy features from the cratered highlands to come.

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First binary quasar found

9:48 am

Double quasar as seen by the Hubble Space Telescope
Double quasar as seen by the Hubble Space Telescope

Using a suite of telescopes on the ground and in orbit, astronomers have found the first galaxy made up of two quasars, supermassive black holes that are very active in eating material from around them.

ESA’s (European Space Agency) Gaia space observatory first detected the unresolved double quasar, capturing images that indicate two closely aligned beacons of light in the young universe. Chen and his team then used NASA’s Hubble Space Telescope to verify the points of light were in fact coming from a pair of supermassive black holes.

Multi-wavelength observations followed; using Keck Observatory’s second generation Near-Infrared Camera (NIRC2) paired with its adaptive optics system, as well as Gemini North, NASA’s Chandra X-ray Observatory, and the Very Large Array network of radio telescopes in New Mexico, the researchers confirmed the double quasar was not two images of the same quasar created by gravitational lensing.

The two quasars are estimated to be only about 10,000 light years apart. Scientists estimate that this galaxy is about ten billion light years away, and exists in this state only about three billion years after the Big Bang.

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Scientists try to model what would happen if Ryugu hit Earth

9:19 am

Ryugu's northen hemisphere
Ryugu’s northen hemisphere. The arrow marks the spot Hayabusa-2
gathered samples

Scientists, using the data and rock samples gathered by the Japanese probe Hayabusa-2, have attempted to predict what what would happen if the rubble-pile asteroid Ryugu hit the Earth.

Without diversion intervention, Tanaka explained, if the Ryugu asteroid was heading to Earth and entered the planet’s atmosphere at an angle of 45 degrees and at a speed of around 38,000 miles per hour (17 kilometers per second), the rubble pile asteroid would break up at an altitude of around 25 to 21 miles (40 to 35 km) over the surface of the planet.

This would result in an “airburst” similar to that seen over Russia in February 2013 when the Chelyabinsk meteor erupted at an altitude of around 19 miles (30 kilometers) over Earth. The result of the Chelyabinsk blast was a bright flash of light and an atmospheric blast equivalent to the detonation of 400–500 kilotons of TNT. This is as much as 33 times the energy released by the atomic bomb that devastated Hiroshima at the end of the Second World War.

The Chelyabinsk meteor caused about 1,500 injuries, mostly from people injured by glass thrown out by breaking windows when it suddenly and unexpectedly exploded during re-entry. With Ryugu this would not be a surprise, so these injuries could be reduced, though not eliminated. The damage and injuries from pieces that survived the breakup and hit the ground remains unknown because scientists don’t know how much of the asteroid would survive the break up.

Ryugu of course poses no threat, because it is not on a collision course with Earth. Whether an asteroid like Ryugu could be diverted however remains unknown, since any such diversion must not cause the asteroid to break apart as well.

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The outermost edge of Mars’ north polar icecap

11:28 am

The outermost edge of Mars' north polar icecap
Click for original image.

Cool image time! The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on February 4, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows the terminating cliffs of the north pole ice cap of Mars, dubbed Rupes Tenius on this side of the icecap.

At this point the elevation difference of the icecap’s edge from top to bottom is not significant, only about 1,500 feet or so, though this is a very rough estimate. As with all other images of the ice cape’s edge, there are many many layers visible, all indicating a different cycle in the climate history of Mars as its rotational tilt swings from about 11 degrees to 60 degrees over eons.

Moreover, at this point there is likely not that much difference between the terrain on top and the terrain below. Both will be mixed ice and dust and coarse rocks, though the percentages will be shifting towards less ice as we go down.
» Read more

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A journey into Martian chaos

5:12 pm

Overview map of Aram Chaos

With today’s cool image, we shall begin with the overview map, and drill our way down until we get a close look at another example of truly alien Martian terrain, with only a hint of similarity to comparable geology on Earth.

The overview map to the right shows us Aram Chaos, an ancient 170-mile-wide impact crater that has gone through such complex geology that it is difficult, maybe impossible, to unravel it based on data obtained from orbit. As I wrote in a detailed December 2020 post describing the confusing geology of this crater,

The floor of Aram Chaos is a place of great puzzlement to planetary geologists. The geology there is incredibly complex, and includes chaos terrain overlain by several sedimentary layers of sulfate minerals. The chaos terrain is most obvious in the southern part of the crater’s floor. The flat areas near the eastern center are those overlaying sedimentary layers.

When we zoom into the white box we can see a good example of this complexity.
» Read more

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Ingenuity completes 49th flight on Mars

1:37 pm

Overview map
Click for interactive map.

The Ingenuity team today posted the official flight totals for the Mars helicopter’s 49th flight, which took place yesterday.

The helicopter flew 925 feet for 143 seconds, or two minutes and twenty-three seconds. The plan had been to fly 894 feet for 135 seconds, but has been happening consistently for the past dozen or so flights, the helicopter spent a little more time in the air and traveled a little farther.

As for altitude, it apparently did exactly as planned, averaging about 40 feet in height until the end of the mission, when Ingenuity went straight up another twelve feet to get a wider view of its landing area.

The map to the right shows the context. The green dot marks Ingenuity’s location at the start of the flight. The green line indicates my approximate estimate of its flight path and landing area, which the engineering team has not yet posted. The white dots and line mark Perseverance’s path, with its present location at the area dubbed Tenby where it has obtained its first core sample from the top of the delta.

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Sunspot update: Activity remained high in March

12:35 pm

It is time for my monthly sunspot update. NOAA this week updated its graph that tracks the number of sunspots on the Sun’s Earth-facing hemisphere. This graph is posted below, with some additional details included to provide some context.

Last month the number of sunspots dipped slightly after a gigantic leap of activity in January. This month showed a small rise in activity, but not enough to bring levels back to the January’s levels. Nonetheless, activity remains the highest seen since 2014. when the last solar maximum was approaching its end, and continues to exceed significantly the 2020 prediction by NOAA’s panel of solar scientists.
» Read more

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Update on MOXIE’s two years on Mars, producing oxygen

9:17 pm

Link here. MOXIE is a technology test instrument on the rover Perseverance that has proven it will be possible to practically produce sufficient oxygen from the Martian atmosphere to sustain a human colony.

The link provides a nice summary of everything the engineering team has accomplished since Perseverance landed in testing this technology. As I wrote in my December post about MOXIE’s achievements:

Based on these tests, MOXIE has unequivocally proven that future human explorers will not need to bring much oxygen with them, and will in fact have essentially an unlimited supply, on hand from the red planet itself. More important, MOXIE has also proven that the technology to obtain this oxygen already exists.

All we need to do is plant enough MOXIE trees on Mars.

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Sponge terrain on Mars

11:44 am

Sponge terrain on Mars
Click for original image.

Cool image time! The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on January 11, 2023 by the high resolution camera on Mars Reconnaissnace Orbiter (MRO).

The scientists labeled this picture “Rocky Terrain.” Though this describes the overall sense of the full image, it fails to capture correctly the nature of this patch of ground at the center of the picture. As you can see, this patch of spongelike surface starts and ends abruptly. It appears that it is a layer on top of the surrounding terrain that has also been eroded aggressively since its placement.

The many craters on its surface seem to have come later, though as the crater size diminishes it becomes harder to separate the craters from the sponge holes. Moreover, some of the larger craters are distorted in shape, as if the impact hit material that was viscous and could flow somewhat.

The overview map below gives some context, but only some.
» Read more

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A bubbly cauldron on the surface of Mars

12:49 pm

A bubbly cauldron on the surface of Mars
Click for original image.

Cool image time! The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on December 20, 2022 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows a strange terrain of craters and mounds, with all the mounds having pits within them like volcanic calderas. In between the surface has a two-toned stippled look, as if two different materials are in the process of mixing.

My immediate impression was that of the bubbly surface of a vat of tomato sauce simmering. Or maybe the vile mixture created by the witches in Shakespeare’s Macbeth, which as they mix they chant:

First witch:
Round about the cauldron go;
In the poison’d entrails throw.
Toad, that under cold stone
Days and nights has thirty-one
Swelter’d venom sleeping got,
Boil thou first i’ the charmed pot.

ALL:
Double, double toil and trouble;
Fire burn, and cauldron bubble.

Of course, this is not a vat of witch’s brew or tomato sauce. It is the surface of the planet Mars, but an alien surface nonetheless.
» Read more

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Psyche asteroid mission now scheduled for October 2023 launch

3:40 pm

After a year delay because certain flight software was not ready on time for its first launch window in the fall of 2022, the science team for the Psyche asteroid mission are now aiming for an October 2023 launch.

The launch period will open Oct. 5 and close Oct. 25. The asteroid, which lies in the outer portion of the main asteroid belt between Mars and Jupiter, may be the remains of a core of a planetesimal, a building block of a rocky planet.

Due to the new launch date, Psyche has a new mission plan, which includes a flyby of Mars for a gravity assist and arrival at the asteroid in August 2029. The mission then will enter its 26-month science phase, collecting observations and data as the spacecraft orbits the asteroid at different altitudes.

Meanwhile, the two Janus probes that were to launch with Psyche last year remain in limbo, as this new Psyche launch date is useless to that mission’s plan to fly past a different asteroid.

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The chaos between galaxies following their head-on collision

2:09 pm

The chaos between galaxies following their head-on collision
Click for original image.

Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken using the Gemini North ground-based 8-meter telescope in Hawaii. It shows two spiral galaxies about 180 million light years away following a head-on collision about 25 million years ago, in which the smaller spiral moved through the larger from the bottom to the top.

Upon exiting, the smaller spiral trailed behind it the reddish stream of material, while its outside arms on the right were bent downward. That trailing material is why astronomers have dubbed these the “Taffy Galaxies.” Imagine pulling two clumps of taffy apart. The stretched material linking the two clumps is the bridge of trailing material between these two galaxies. From the caption:

When the Taffy Galaxies’ collided, their galactic disks and gaseous components smashed right into each other. This resulted in a massive injection of energy into the gas, causing it to become highly turbulent. As the pair emerged from their collision, high-velocity gas was pulled from each galaxy, creating a massive gas bridge between them. The turbulence of the stellar material throughout the bridge is now prohibiting the collection and compression of gas that are required to form new stars.

The evolution of galaxies is incredibly slow, from the perspective of human existence. For example, this first collision 25 million years ago seems like it took a long time, but it will likely be followed by many more over the next billion years, eventually resulting in a single spherical elliptical galaxy. On the time scale of the universe, collisions every 100 million years or so means galaxies like this can mix and collide many times, and do so well within the existence of the theorized lifespan of the universe itself.

To us short-lived humans, however, this process just seems so slow it can’t possibly happen as described. But it does.

Sidebar: It appears this image was released to herald the repair of Gemini North’s primary mirror, which was damaged in two places on its edge during a recoating operation on October 20, 2022. Since then the telescope has been shut down as repair operations were undertaken. That repair is now complete, and it is expected the telescope will resume science observations in a few weeks.

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Zhurong: Small polygons on light curved dunes indicate regular atmospheric water interaction

1:12 pm

Zhurong's full journey on Mars

A paper published this week in Geophysical Research Letters by the science team for China Zhurong Martian rover has revealed the discovery of small polygon cracks on the surface of the many curved light-colored small dunes found in the region where Zhurong landed, suggesting the possibility of relatively recent water activity between the atmosphere and the dune surfaces.

Those dunes, dubbed transverse aeolian ridges (TARs) by the science team, are the many light curves visible in the labeled Mars Reconnaissance mosaic to the right. The blue arrows indicate Zhurong’s path south from its landing spot at the top and ending near the bottom of the picture after traveling about 1,400 feet.

According to the paper, the TARs were formed by the prevailing winds over many eons, coming first from the north and then from the northwest. The edges of the ridges, being smaller, are pushed ahead quicker, thus creating the curved shape. The polygons were small, never larger than 4 inches in size, with five to six sides. The scientists theorize that they were formed when atmospheric water interacted with the dune crust, causing fractures “due to temperature/moisture changes or deliquescence/dehydration cycling of salts”. This process could be slow or fast, and could actually be occurring in relatively recent times, as the scientists say it requires only a little water in the atmosphere.

More likely however we are seeing evidence of water from the past, from tens of thousands to several million years ago.

Zhurong meanwhile remains in hibernation, and might never come out of that condition. Orbital images indicate that its solar panels are dust-covered, the result of the heavy winter dust storm season. The project team however is hopeful that with time and the arrival of Martian summer the dust will be blown off and they can reactivate the rover. This hope however entirely depends on the arrival of a dust devil acoss the top of Zhurong, a random event that cannot be predicted. With both the Spirit and Opportunity rovers, such events happened regularly, allowing those missions to last years instead of only 90 days. With InSight it never happened, and the lander died after two-plus years on Mars.

Zhurong’s future fate thus remains unknown, but not promising at this moment.

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New map of the volcanoes of Venus

11:27 am

Map of Venus' volcanoes
Click for original image.

Using the archival radar data from the Magellan orbiter that circled Venus in the early 1990s, scientists have produced a new map of the volcanoes of Venus.

That map is to the right, and is publicly available for download.

Byrne and Hahn’s new study includes detailed analyses of where volcanoes are, where and how they’re clustered, and how their spatial distributions compare with geophysical properties of the planet such as crustal thickness. Taken together, this work provides the most comprehensive understanding of Venus’ volcanic properties — and perhaps of any world’s volcanism so far … because, although we know a great deal about the volcanoes on Earth that are on land, there are still likely a great many yet to be discovered under the oceans. Lacking oceans of its own, Venus’ entire surface can be viewed with Magellan radar imagery.

Although there are volcanoes across almost the entire surface of Venus, the scientists found relatively fewer volcanoes in the 20-100 km diameter range, which may be a function of magma availability and eruption rate, they surmise.

This new map catalogs about 85,000 volcanoes, but is also considered incomplete because the resolution of the Magellan data makes identifying volcanoes smaller than 1 kilometer impossible. It will require new orbiters to spot these volcanoes.

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Looking back from the foothills of Mount Sharp

10:17 am

Panorama looking back across Gale Crater, March 29, 2023
Click for original image.

Overview map
Click for interactive map.

The panorama above, cropped to post here, was taken today by the left navigation camera on the Mars rover Curiosity. It looks back at the rover’s previous travels, though only the terrain traveled in the past few months is visible, the rover having reached this point through the notch to the left of the distinctly dark mesa in the center of the picture. The lower flanks of Mount Sharp the rover traversed to get here are now blocked from view.

Instead, the image provides a spectacular example of the views north from Curiosity’s present position. The overview map to the right provides us the full context of the entire ten-plus year journey since Curiosity landed safely on Mars on August 5, 2012. The white squiggly line indicates the rover’s route. The yellow lines mark the approximate area covered by the panorama. The rim of Gale Crater is about 20-25 miles away.

As you can see, as spectacular as this view is, the journey up Mount Sharp has barely begun. Mount Sharp’s peak is about 18,000 feet high. The rover at this point has only climbed about 4,600 feet from the floor of Gale Crater.

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Hakuto-R1 snaps first picture of Moon from lunar orbit

9:18 am

Hakuto-R1's first released image from lunar orbit
Click for original image.

The science team for Ispace’s Hakuto-R1 privately-built lunar orbiter/lander earlier this week released the spacecraft’s first picture of the Moon since entering lunar orbit on March 20, 2023.

That image is to the right, cropped and reduced to post here. The photo resolution is quite good. It also demonstrates that the spacecraft’s attitude control systems for pointing the camera are working correctly.

Launched on December 11, 2022 by a Falcon 9 rocket, Hakuto-R1 will land in Atlas Crater on the northeast quadrant of the Moon’s visible hemisphere sometime in April, making it the first successful private commercial planetary lander to reach another world. If successful, it will then release the United Arab Emirates Rashid rover, that nation’s first planetary lander but its second planetary mission, following the Mars orbiter, Al-Amal, now circling Mars.

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Mars’ largest mountain region

1:05 pm

Mars' largest mountain region
Click for original image.

The picture to the right, rotated, cropped, reduced, and enhanced to post here, was taken on September 21, 2015 by the context camera on Mars Reconnaissance Orbiter (MRO). I originally was going to post a high resolution image of some of these mountains, taken on January 1, 2023 that showed some slope streaks, but quickly realized that a wider view of this mountain region was a much more interesting story.

This picture covers an area about 50 by 50 miles. As you can see, it is endless series of random hills ridges and peaks, with only a vague hint of a northeast to southwest alignment. Ground travel through this region would be slow and twisty, immediately reminding me of my many trips to West Virginia, where the hills and valleys are almost as random and never ending.

The overview map below however suggests the scale of this region exceeds West Virginia many times over.
» Read more

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Webb finds Earth-sized exoplanet likely too hot to have atmosphere

9:25 am

The uncertainty of science: Using the infrared Webb Space Telescope, scientists have measured the temperature of the Earth-sized exoplanet, dubbed Trappist-1b, and found its temperature is probably too hot to have atmosphere.

The red dwarf star Trappist-1is about 40 light years from Earth, and in 2017 was found to have a solar system of seven exoplanets, all rocky terrestrial planets like the inner planets of our solar system. Trappist-1b is the innermost exoplanet. To measure its temperature, Webb observed the star while the planet was eclipsed by the star as well as when it was not, and measured the tiny difference in infrared light.

The team analyzed data from five separate secondary eclipse observations. “We compared the results to computer models showing what the temperature should be in different scenarios,” explained Ducrot. “The results are almost perfectly consistent with a blackbody made of bare rock and no atmosphere to circulate the heat. We also didn’t see any signs of light being absorbed by carbon dioxide, which would be apparent in these measurements.”

As this was the innermost of the star’s solar system, it is also the one most likely to lack an atmosphere. Webb’s observations of the system continue, so there is a chance that data about the other exoplanets will eventually tell us more about them.

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Scientists detect water inside lunar samples returned to Earth by Chang’e-5

7:53 pm

Chinese scientists have found water molecules trapped within glass beads found within the lunar samples returned to Earth by the lunar lander Chang’e-5.

The team polished and analysed 117 glass beads which were scooped up by China’s Chang’e-5 spacecraft in December 2020 and brought back to Earth. The beads are formed by tiny meteorites that bombard the surface of the Moon, which lacks the protection of an atmosphere. The heat of the impact melts the surface material, which cools into round glass beads around the width of a strand of hair.

…The glass beads may make up around three to five percent of lunar soil, according to the study. A “back of the envelope” calculation suggested that there could be around a third of a trillion tonnes of water inside all the Moon’s glass beads, he added. And it only takes mild heat of around 100 degrees Celsius (210 Fahrenheit) to liberate the water from the beads, Anand said.

According to the paper, the water’s origin might be tied to the solar wind, and might have been implanted in the beads after their impact formation.

If this analysis is correct, it might explain the hydrogen signature found in large parts of the lunar surface, where it is believed water simply couldn’t exist. It also might explain why the first images inside permanently shadowed lunar craters show no obvious ice, only what appear to be ponds of dark dust. The dust might contain these beads, and thus explain the hydrogen signature detected there as well.

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A Martian crater with a surface pattern that resembles hanging draperies

2:45 pm

A Martian crater with a surface pattern like hanging draperies

Cool image time! The picture to the right, rotated, cropped, reduced, and enhanced to post here, was taken on January 27, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO), and shows what the scientists label a “streak-spoke pattern” inside the crater. To my eye, the pattern more resembles hanging draperies, neatly tied near the top and then pulled apart as they descend to the ground.

This photo was a follow-up to a previous picture by MRO on February 4, 2008, more than seven Martian years ago, to see if there had been any identifiable changes in that time. Both images were taken in springtime, and despite the passage of time, the 2023 image shows no obvious changes from the 2008 photo.

What caused this distinct pattern? The first guess would be the wind, except if so shouldn’t there have been some change over seven Martian years?
» Read more

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A multitude of strange galaxies

11:57 am

A multitude of strange galaxies
Click for original image.

Cool image time! The picture to the right, reduced and sharpened to post here, was taken by the Hubble Space Telescope and released today. From the caption:

Z 229-15 is one of those interesting celestial objects that, should you choose to research it, you will find defined as several different things: sometimes as an active galactic nucleus (an AGN); sometimes as a quasar; and sometimes as a Seyfert galaxy. Which of these is Z 229-15 really? The answer is that it is all of these things all at once, because these three definitions have significant overlap.

All three classifications involve galaxies with nuclei that are brighter, more energetic, and more massive than the rest of the galaxy. Z229-15 itself is estimated to be 390 million light years away.

Normally I would have cropped the image to center on Z229-15. However, I was struck by the number of other strange galaxies in the distance and on the periphery of the picture. Near the top is a trio of three, none of which appear spiral- or elliptical-shaped. On the right is a galaxy that could be a standard spiral seen edge-on, but its red nucleus is very unusual. And scattered across the bottom half of the image are a number of weirdly shaped galaxies of all types, none of which appear typical.

Be sure to look at the high resolution original. There are more weird galaxies visible there.

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Curiosity heads to the west of the Hill of Pillows

10:18 am

Panorama on March 27, 2023 (Sol 3781)
Click for full resolution panorama. The original images can be found here, here, here, here, and here.

Overview map
Click for interactive map.

In my previous post on March 11, 2023 showing Curiosity’s spectacular view at that time in the foothills of Mount Sharp, the main question was: Which route will the rover take in the next few weeks? Based on the panorama above, created from five pictures taken by Curiosity’s right navigation camera today, it now appears that the science team has made its decision and will have the rover traverse to the west of what I label the Hill of Pillows.

The overview map to the right gives the context. The blue dot marks Curiosity’s position three days ago, with the yellow lines indicating the approximate area covered by the panorama. The red dotted line shows the planned route going past the Hill of Pillows to the east.

The science team took a careful look at the terrain in both directions, and decided the route to the west was both more gradual and less rough. This set of images by the navigation camera was now taken to better plan the route up in this hollow among its rock-strewn ground.

Make sure you look at the full resolution version of the panorama. You can see on the horizon the high mesas in the south just beginning to appear.

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Ancient Martian landslides

5:45 pm

Ancient Martian landslides
Click for original image.

Cool image time! The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on December 23, 2022 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). The image was labeled “Landslides in Orson Welles Crater” because the full photo shows at least two large and obvious slides, with the biggest shown to the right.

These avalanches are likely ancient because both have craters on them suggesting the material has not moved for a very long time. Yet when both flowed they did so almost like mud, the material moving downhill almost in a single blobby mass. Both have this look, as do many Martian landslides, which I think is why the scientists usually label them mass wasting events.
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Hubble spots long term seasonal changes on Uranus

10:20 am

Uranus as seen by Hubble in 2014 and 2022
Click for original image.

Using images of Uranus taken eight years apart by the Hubble Space Telescope, astronomers have detected significant seasonal changes in the atmosphere of the gas giant, caused by its unusual sideways rotation.

The two pictures to the left, realigned and reduced to post here, show the changes. If you look closely you can see the planet’s ring system and its shift to almost face on at present.

[top] — This is a Hubble view of Uranus taken in 2014, seven years after northern spring equinox when the Sun was shining directly over the planet’s equator, and shows one of the first images from the OPAL program. Multiple storms with methane ice-crystal clouds appear at mid-northern latitudes above the planet’s cyan-tinted lower atmosphere. Hubble photographed the ring system edge-on in 2007, but the rings are seen starting to open up seven years later in this view. At this time, the planet had multiple small storms and even some faint cloud bands.

[bottom] — As seen in 2022, Uranus’ north pole shows a thickened photochemical haze that looks similar to the smog over cities. Several little storms can be seen near the edge of the polar haze boundary. Hubble has been tracking the size and brightness of the north polar cap and it continues to get brighter year after year. Astronomers are disentangling multiple effects – from atmospheric circulation, particle properties, and chemical processes – that control how the atmospheric polar cap changes with the seasons. At the Uranian equinox in 2007, neither pole was particularly bright.

To really understand the long term climate of Uranus will likely take centuries, since its year lasts 84 Earth years. Since the beginning of space exploration, we have only had now about forty years of good imagery of the planet, and even that has been sporadic and very incomplete.

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Where the flood lava of two gigantic Martian volcanoes meet

5:46 pm

Where the flood lava of two gigantic Martian volcanoes meet
Click for original image.

Today’s cool image illustrates once again the importance of looking not simply at the picture but at the surrounding larger context in order to understand the Martian features within the photograph.

The photo to the left, cropped, reduced, and sharpened to post here, was taken on January 31, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). The location is at 26 north latitude, so it is in the dry equatorial regions. It shows what appears to be a large Martian flood lava plain, with at least two different flood lava events appearing to flow to the northeast, with the second only partly covering the first.

From this high resolution image it seemed probable that the source of the flow was from the southwest, an assumption that at first glance is strengthened by the overview map below.
» Read more

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Ingenuity completes 48th flight on Mars

11:33 am

Overview map
Click for interactive map.

On March 21, 2023 the Mars helicopter Ingenuity successfully completed its 48th flight on Mars, flying 1,305 feet for 149.9 seconds with a top altitude of 39 feet. As has now become routine on all the recent flights, the distance and time in the air exceeded slightly the planned amounts, probably because Ingenuity needed slightly more time to find a good landing spot.

The link provides a very short movie created from images looking down during the flight.

The map to the right provides the context. The green dot and line indicates Ingenuity’s new position and flight path respectively. The blue dot marks Perseverance’s present location, a spot the mission planners had previously targeted as a prime place for obtaining core samples. The red dotted line shows the rover’s planned route.

Since the science team is now using Ingenuity for scouting purposes, its turn towards the rim of Belva Crater suggests they are considering this detour for Perseverance as well.

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NASA engineers continue to struggle to save the Flashlight lunar probe

10:30 am

In an update today, NASA reports that engineers continue to troubeshoot the failure of the experimental thrusters on the Lunar Flashlight cubesat, in an effort to improvise a way to get the probe into lunar orbit.

Shortly after launch on Dec. 11, 2022, the operations team for NASA’s Lunar Flashlight determined that three of the four CubeSat’s thrusters were underperforming. This cast doubt on whether the mission could complete its stretch science goal of detecting surface ice at the Moon’s South Pole. After analyzing the situation, team members at NASA’s Jet Propulsion Laboratory and Georgia Tech arrived at a creative maneuvering technique that would use the one fully-functioning thruster to get into planned orbit. But when attempting the modified maneuvers in January, that thruster also experienced a rapid loss in performance and the team determined that Lunar Flashlight would likely be unable to reach its planned near-rectilinear halo orbit around the Moon.

After further troubleshooting, the operations team has been working on ways to restore partial operation of one or more thrusters to keep the spacecraft within the Earth-Moon system. They have had some success but continue to try new things to clear the suspected obstructions in the thruster fuel lines. They have until the end of April to generate the required thrust to preserve the opportunity to allow for monthly flybys of the lunar South Pole.

Though it increasingly appears Lunar Flashlight will not make lunar orbit, the mission is not a failure, since it was first and foremost an engineering mission testing a variety of new cubesat technologies, including the failed thrusters. Their failure and the efforts by engineers to recover them is important data for developing better cubesat thrusters on future such planetary probes.

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Confused glaciers in a Martian crater

5:59 pm

Confused glaciers in a Martian crater
Click for original image.

Cool image time. The picture to the right, cropped to post here, was taken on February 2, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO), and shows a strangely blobby crater in the northern mid-latitudes where glacial features are frequently found inside craters.

In this case however the glacier seems very confused. As this is in the northern hemisphere, you would expect glacial material to survive on the north-facing southern interior slopes of the crater, where there is year-round less sunlight. The mottled eroded terrain in the south part of the crater floor suggests this. However, the crater also clearly has a terraced glacier on its south-facing northern interior slopes.

Why has the glacial material survived in both places, but not in the center of the crater?

In addition, there is that strange roughly circular feature attached to the south side of the crater. What formed it? Is it a glacier on the plains surrounding the crater? Or are we looking at volcanic material?

This crater is also unique. The crater just to its southwest (partly seen in the cropped image above), is a much more typical glacial-filled mid-latitude crater, its interior material more evenly distributed and its circular rim only slightly distorted.
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No ice inside permanently shadowed crater near Moon’s south pole?

12:44 pm

Marvin crater as seen by Shadowcam
Click for original image.

Overview map

Using a camera on South Korea’s lunar orbiter Danuri, dubbed Shadowcam and designed to look into the permanently shadowed craters at the Moon’s poles, scientists have taken an image that sees into the forever dark region of one such crater.

The picture to the right, released on March 13, 2023 by the Shadowcam science team, is of the crater Marvin, located about 16 miles to the east of the south pole. The pink outline indicates the area that is thought to be permanently shadowed.

The second image to the right provides a wider view of the south pole region, with the craters labeled and outlined by the green lines. The orange lines mark permanently shadowed areas. The white box indicates the approximate area covered by the Shadowcam picture. One of the candidate landing sites for Starship, as part of NASA’s Artemis program, is the eastern rim of Shackleton, essentially at the south pole itself.

Previous data suggests that ice should be found in those permanently shadowed areas, because other orbiters have detected evidence of hydrogen there. The Shadowcam picture above however shows nothing that strongly suggests the presence of ice, unless that darker flat area on the floor of the crater is ice-infused dust. If so however, it is quite ancient and solid, based on the presence of several craters within it.

The press release makes no mention of this question, probably because the scientists are still analyzing the data. This first look however suggests the ice is not there, or is in a form that is going to require a lot of processing to extract the water from it.

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