Tag: science

Close-up of Helene, one of Saturn’s many many moons

2:04 pm

Helene, as seen by Cassini in 2011
Helene, as seen by Cassini in 2011

Cool image time! Though the Saturn orbiter Cassini is long gone, having been sent into Saturn’s atmosphere to burn up in 2017, its image archive of magnificent pictures is still available to peruse. To encourage others to do so, NASA today issued a series of press releases, listing the spacecraft’s top ten pictures from 2011, 2012, 2013, 2014, and 2015.

The picture to the right, cropped, reduced, and sharpened to post here, comes from the 2011 collection and was taken on June 18, 2011. It shows a close-up of 21-mile-wide Helene, one of Saturn’s many many moons and only discovered in 1980. Back in 2010 I featured another Cassini image of Helene, but that picture did not reveal the small surface features seen in the photo to the right.

The light and dark streaks probably indicate dust flowing downhill on the surface. Though the gravity of this object is tiny, it will be enough for dust to act like almost like a liquid, flowing down grade and then pooling in the central pond at the lowest point near the center of the picture. That process is so much like liquid flowing that it appears to have even eroded gullies on slopes near the top and bottom of the picture.

Side note: NASA’s “Science Editorial Team” also issued a press release today that falsely and ignorantly claimed these releases were “to celebrate 10 years since arriving at Saurn,” implying that Cassini arrived in 2013 and is still functioning.

The problem is that Cassini arrived in orbit around Saturn in 2004 and as I noted above ended its mission in 2017. It thus appears that the NASA Science Editorial Team is unable to do even one five-second web search to find out what really happened.

Just another data point indicating the dark age we now live in.

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British scientists get their own Bennu sample to study

9:16 am

The British History Museum has now received a small sample of material from the asteroid Bennu, brought back to Earth by the planetary probe OSIRIS-REx.

The first two years of research at the Natural History Museum will focus on non-destructive tests, such as X-ray diffraction and electron microscopy to learn about Bennu’s mineral composition and structure. The largest grains in the sample are on the order of millimetres wide, while the smallest are mere dust particles. “It doesn’t sound like a lot of material, but it’s plenty to work with,” King said.

The museum is home to one of the world’s leading meteorite collections, and the staff are well-used to handling small amounts of extremely precious materials from outer space. Unlike meteorites that have been baked and battered on their fiery passage through Earth’s atmosphere, the dust and rocky fragments from Bennu were brought to Earth in pristine condition, allowing scientists a rare glimpse of the unaltered asteroid.

The last sentence says it all. Up until recently, researchers have had a distorted view of the overall make-up of asteroids because the oldest kinds, carbonaceous chondrite, are the most delicate and get significantly changed by their passage through the Earth’s atmosphere. The samples from Bennu and Ryugu are changing this, and will eventually revolutionize the understanding scientists have of our present solar system.

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Mars’ giant sinkholes

12:15 pm

The floor of one of Mars' giant sinkholes

Cool image time! The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on June 27, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows a small section of the floor and northern slope of Hebes Chasma, one of the many very large enclosed pits that can be found to the north of Valles Marineris, the largest canyon in the solar system. Though Hebes seems small next to the 1,500 mile long Valles Marineris, it still is 200 miles long by 80 miles wide, and could easily fit a half dozen Grand Canyons within it.

For example, the Grand Canyon is from 4,420 to 5,400 feet deep, hiking down from the south and north rim lodges respectively, which sit about ten miles apart. On this picture, the peak on the right sits about 5,300 feet above and only about 3.8 miles from the low spot on the bottom left, which means this one small picture encapsulates the Grand Canyon. And yet, the northern rim of Hebes sits another 21,000 feet higher and twelve miles away. And the entire chasma itself extends 50 miles to the west, 150 miles to the east, and 50 miles to the south.
» Read more

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Striped terrain on Mars

12:39 pm

Overview map

Striped terrain on Mars
Click for original image.

Today’s cool image will be a mystery with the answer below the fold. Before you look at the answer, however, you must try to come up with your own explanation for the picture to the right, cropped to post here, that was taken on September 25, 2018 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).

What we see in this picture is what looks like a striped terrain, alternating bands of light and dark. What caused the bands? Why the different colors?

The overview map above provides some clues. The white rectangle inside Juventae Chasma near the map’s center marks the area within which this picture was taken, though the picture to the right covers only about a pixel inside that rectangle.

Can you guess what these stripes reveal, from this little information? For this quiz to work you must make a guess, but be prepared to be wrong and quickly reassess your conclusions. Such is the real scientific method, so rarely taught now in schools.
» Read more

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China delays till ’25 the launch of its Hubble-class optical space telescope

9:34 am

China today revealed that it is delaying the the launch of its Xuntian space telescope from early next year to 2025.

Zhan Hu, project scientist of Xuntian space telescope system, revealed that the delay was necessary for the team to finalize a preflight “engineering qualification model.” This model will undergo rigorous performance tests early next year. Despite the setback, China is making significant strides by domestically developing all five instruments for Xuntian, a first for the country, Scientific American reported.

The optical telescope, designed to somewhat comparable to Hubble, is intended to fly close to China’s Tiangong-3 space station where astronauts will periodically fly over to do maintenance and repair. Its primary mirror, two meters in diameter, is only slightly smaller than Hubble’s 2.4 meter mirror.

The article says the launch was supposed to happen before the end of this year, but that is incorrect. The launch has been targeting the spring of 2024 since February.

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Martian ice sheets sublimating like peeling paint?

2:02 pm

Overview map

Martian ice sheets resembling paint peeling
Click for original image.

Cool image time! The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on September 19, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).

The features are described as “ribbed terrain” in the label. To my eye they more resemble flakes of peeling paint, most especially the mesas in the lower left. On the full image there are many more examples that resemble old paint peels, barely attached to the wall.

The white dot on the overview map above marks the location, deep inside the 2,000-mile-long strip in the northern mid-latitudes I dub glacier country, because everything seems covered by glacial features. This location is at 42 degrees north latitude, where plenty of near-surface ice features are found on Mars.

At first glance it looks like the top “paint-peel” layers to the south have been slowly sublimating away, leaving behind the smooth plain to the north. The problem is that this smooth area in the full image actually appears to be a glacial ice sheet of its own, filling all the low areas between mesas.

In other words, we are probably looking at layers and layers of ice sheets, each created during a different Martian climate cycle, caused by the wide swings of the planet’s rotational tilt, or obliquity.

The location is within Arabia Terra, the largest transitional zone on Mars between the northern lowland plains and the southern cratered highlands. Thus it sits above the glaciers that fill the lower regions of chaos to the north. What we have here is terrain that will eventually become chaos terrain, as the narrow faults and cracks are slowly widened into canyons by the cycles of glacial activity.

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NASA laser communication experiment succeeds in sending data from beyond Moon

9:12 am

A NASA laser communication experiment on the asteroid probe Psyche succeeded on November 14, 2023 in sending data to and from the spacecraft as it traveled away from Earth.

NASA’s Deep Space Optical Communications (DSOC) experiment has beamed a near-infrared laser encoded with test data fromnearly 10 million miles (16 million kilometers) away – about 40 times farther than the Moon is from Earth – to the Hale Telescope at Caltech’s Palomar Observatory in San Diego County, California. This is the farthest-ever demonstration of optical communications.

Riding aboard the recently launched Psyche spacecraft, DSOC is configured to send high-bandwidth test data to Earth during its two-year technology demonstration as Psyche travels to the main asteroid belt between Mars and Jupiter. NASA’s Jet Propulsion Laboratory in Southern California manages both DSOC and Psyche.

The experiment seeks to demonstrate the advantages of optical communications, which if successful could have data speeds ten to a hundred times faster than standard high band radio communications. While the technology has been demonstrated as far away as the Moon, this is the first successful test from deep space, a key advance that suggests the technology is becoming mature enough to use on planetary missions.

If so, it could largely replace or at least supplement the various radio-antenna networks on Earth, such as NASA’s Deep Space Network, with smaller and more efficient communication links.

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Ancient volcanic vent on Mars

2:43 pm

Volcanic vent 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 May 28, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).

The picture label describes it as a “Low Shield Vent and Pit Northeast of Arsia Mons,” suggesting these depressions are volcanic in nature. We know the pit in the lower left is not an impact crater because it has no raised rim of ejecta. Instead, it looks like a collapsed sinkhole, formed when the ceiling above a void could no longer support its weight. Similar, the trench to the northeast is aligned with the downhill grade to the northeast, with its features suggesting a vent draining in that direction.

The ample dust inside the trench and pit suggest that it has been a very long time since this vent was active. Research suggests volcanic activity last occurred in this region from 10 to 300 million years ago, so that gives us a rough estimate of this vent’s age. Since then any dust that is blown into it will tend to become trapped there.
» Read more

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India now plans robotic lunar sample return mission

9:58 am

Following the successful landing of Vikram on the Moon, officials of India’s space agency ISRO have announced it is considering a much more ambitious follow-up, Chandrayaan-4, that will not only land on the lunar surface with a much larger rover, it will also dig up some samples and return them to Earth.

The spacecraft will travel to the moon, land, collect samples, and then connect to another module in space. The module will then return to Earth orbit. As the two modules approach Earth, they will separate, with one part returning to Earth and the other will keep orbiting the planet. Desai described the mission as ambitious, stating, “Hopefully, in the next five to seven years, we will meet the challenge of bringing samples from the moon.”

For return to Earth, Desai said that the mission would need two launch vehicles containing four modules (Transfer module, Lander Module, Ascender Module and Re-entry module). RM and TM would be Parked in the lunar orbit and two will go down from which Ascender Module will get separated from lander module and would collect the sample.

If India does this mission, while also completing its first manned mission during that time frame, it will place itself in direct competition with China and the U.S., and in fact will be getting close to matching both in capabilities.

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Webb: Needles scattered near the center of the Milky Way

9:14 am

Needles in space
Click for original image.

Scientists today released a new false-color infrared image taken by the Webb Space Telescope of a region about 300 light years from the center of the Milky Way, dubbed Sagittarius-C. That picture is to the right, cropped, reduced and sharpened to post here. The blue or cyan regions are ionized hydrogen clouds, and with this image were revealed to be much more extensive than expected. The orange blob near the center is a densely packed cluster of protostars, the starlight blocked by the cloud of material.

The most interesting feature however are the needle-like structures within that ionized hydrogen, oriented in all directions in a manner that looks completely random. Though such needles have been seen previously, the data here is far more detailed, and might eventually help astronomers figure out what the heck these features are and what caused them.

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Salt glaciers on Mercury?

10:55 am

From Figure A1 of paper
From Figure A1 of paper.

Based on a new analysis of data from the Messenger spacecrat that orbited Mercury from 2011 to 2015, scientists today posited the possibility that salt glaciers exist on Mercury and have reshaped its terrain in manner vaguely comparable to what Mars Reconnaissance Orbiter (MRO) has found on Mars.

You can read the paper here [pdf]. The image to the right, enhanced by the scientists to bring out the faint blue in the hollows, is remarkably reminiscent of the hollows and scallop terrain found in many places in the high Martian latitudes. From its conclusion:

Detecting widespread elemental volatile surface compositions, ubiquitous sublimation hollows, and extensive chaotic terrains has significantly reshaped our perception of Mercury’s geological past. These observations collectively point to the presence of volatile-rich strata spanning several kilometers in depth and likely formed before the [Late Heavy Bombardment] (∼3.8 billion years ago). This notion challenges the conventional view of a volatile-depleted Mercurian crust.

The morphologies within Mercury’s Raditladi basin bear a striking morphologic resemblance to glaciers on Earth and Mars, suggesting their origin from an impact-exposed [volatile-rich layer], likely containing halite. Our numerical simulations show that the unique rheological properties of halite, including the high thermal sensitivity of its viscosity, reinforce this hypothesis. These glacier-like features occur beyond the chaotic terrain boundaries, indicating a potentially global yet concealed, volatile-rich upper stratigraphy. We posit that the exposure of these volatile-rich materials, instigated by impact events, could have been instrumental in the formation and evolution of hollow features, signifying a complex geodynamic history of volatile migration and redistribution, essentially interconnecting some of the oldest and youngest stratigraphic materials on the planet.

The scientists do not have enough information as yet to determine if these glaciers are still active or not. Moreover, the theorized layer of volatile material near the surface remains unconfirmed, requiring in situ investigation to determine its existence with certainty. Like Mars, if it exists it likely only does so in the high latitudes.

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Researchers confirm it was a Chinese rocket stage that impacted Moon in 2022

9:35 am

Impact, before and after
The crash site is the double crater in the
lower image.

Researchers have now confirmed that the unknown rocket stage that impacted the Moon in 2022 was from a Chinese rocket, a Long March 3B that launched China’s Chang’e-5 lunar sample return mission in November 2020.

“In this paper, we present a trajectory and spectroscopic analysis using ground-based telescope observations to show conclusively that WE0913A is the Long March 3C rocket body (R/B) from the Chang’e 5-T1 mission,” the researchers, led by Tanner Campbell, a doctoral student in the UA’s Department of Aerospace and Mechanical Engineering, wrote in a study that came out Thursday (Nov. 16) in the Planetary Science Journal. These two lines of evidence — how the object was moving and what it was made of — leave little doubt about WE0913A’s provenance, Campbell and his colleagues report.

The data, combined with the unusual double crater caused by the impact, also suggests that this stage had additional unknown equipment at its top, matching the mass of its engines at the bottom. Since the Chinese continue to deny it was their stage and have said nothing about it, we have no idea what that extra equipment might have been.

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Jupiter’s Great Red Spot continues to shrink, possibly to its smallest size ever measured

2:27 pm

Jupiter, as seen by Hubble in 2020
A 2020 Hubble picture of Jupiter.
Click for full image.

Long term data from numerous observatories shows that the Great Red Spot on Jupiter, the largest and longest lasting storm in the solar system, has been continuously shrinking for decades, and appears approaching this year its smallest size ever measured.

Despite so many factors working to keep it “alive” the Spot may be in need of life support. It’s been shrinking for decades. In 2012 the rate of shrinkage abruptly accelerated, something many amateur observers have commented on since that time. Several years later, while still shrinking in diameter, it expanded in latitude becoming more circular. Now it’s narrowed again and continues to diminish in both axes. This observing season I’ve been struck by the Spot’s unusually small size. That, along with its pale pink color and turbulent environment, have made it less obvious than ever.

…Using the WinJUPOS program and one of his recent high-resolution images, Peach measured the Great Red Spot’s diameter on November 6, 2023, at 12,500 kilometers or about 7,770 miles across. If confirmed it would make this season’s GRS not only smaller than the Earth (12,756 kilometers or 7,926 miles across) but the smallest size in observational history. A British Astronomical Association Jupiter section bulletin on October 30th described it as “the smallest it has ever been.” That’s a far cry from the late 1800s when the Spot ballooned to 41,000 kilometers (25,500 miles) — big enough to swallow three Earths with room to spare. Now it can barely contain one!

No one knows if this shrinkage is merely a normal long term fluctuation, or a sign that this many-centuries-old storm is finally dissippating. When it comes to the solar system’s gas giants, their size and long orbits make any firm conclusion difficult in only a few centuries of observation. To understand them properly will likely require thousands of years of observations, covering many orbits and seasons.

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China launches ocean observation satellite

8:52 am

China today successfully launched what it claimed was the first of a new generation of ocean observation satellites, its Long March 2C rocket lifting off from its Jiuquan spaceport in northwest China.

No word on where the rocket’s lower stages, which use toxic hypergolic fuels, crashed inside China.

The leaders in the 2023 launch race:

83 SpaceX
52 China
14 Russia
7 Rocket Lab
7 India

American private enterprise still leads China 95 to 52 in successful launches, and the entire world combined 95 to 81. SpaceX by itself is still leads the rest of the world (excluding American companies) 83 to 81.

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Lava/ice eruptions on Mars

11:49 am

Lava/ice eruptions on Mars
Click for original image.

Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on August 1, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). Labeled by the science team as showing “possible lava-ice interaction,” the photo features some pimply-looking mounds that, though round like craters, sit above the surrounding landscape like small volcanoes.

That these are likely not ancient pedestal impact craters that now sit higher because their material is packed and can resist erosion is illustrated by the bridge-like mound in the lower right. This mound was likely once solid, but its north and south sections have disappeared, either by erosion or sublimation. If formed by an impact the mound would have had a depression in its top center, and would have only eroded outside the rim.
» Read more

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Gamma ray burst 1.9 billion light years away was powerful enough to affect Earth’s atmosphere

9:34 am

One of the most powerful gamma ray bursts (GRBs) ever detected was so powerful that despite occurring about 1.9 billion light years away it was powerful enough to affect Earth’s atmosphere.

On 9 October 2022, for 7 minutes, high energy photons from a gigantic explosion 1.9 billion light-years away toasted one side of Earth as never before observed. The event, called a gamma ray burst (GRB), was 70 times brighter than the previous record holder. But what astronomers dub the “BOAT”—the brightest of all time—did more than provide a light show spanning the electromagnetic spectrum. It also ionized atoms across the ionosphere, which spans from 50 to 1000 kilometers in altitude, researchers say. The findings highlight the faint but real risk of a closer burst destroying Earth’s protective ozone layer.

“It was such a massive event, it affected all levels of the atmosphere,” says solar physicist Laura Hayes of the European Space Agency (ESA).

None of these consequences were harmful or even noticeable to any life on Earth, but the data proved without question that a GRB close by within the Milky Way could have been the cause of one or more of the past extinction events. It also proved that a future such nearby explosion could do the same again.

At present astronomers think that GRBs are caused either by the collapse of a massive star into a black hole, during a supernovae event, or by the merger of two neutron stars. Neither conclusion is proved as yet, though the evidence has eliminated most other theories.

For astronomers this GRB was significant because its strength allowed many different telescopes and detectors to record it, in many different wavelengths. Having such a wealth of information helps them better figure out what happened when the burst occurred.

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Scientists: More evidence cosmic rays come from nearby supernova remnants

9:07 am

The uncertainty of science: According to high energy data from an instrument on ISS, astronomers found more evidence that the cosmic rays that enter our solar system likely come from nearby supernova remnants.

Current theory posits that the aftermath of supernovae (exploding stars), called supernova remnants, produce these high energy electrons, which are a specific type of cosmic ray. Electrons lose energy very quickly after leaving their source, so the rare electrons arriving at CALET with high energy are believed to originate in supernova remnants that are relatively nearby (on a cosmic scale), Cannady explains.

The study’s results are “a strong indicator that the paradigm that we have for understanding these high-energy electrons—that they come from supernova remnants and that they are accelerated the way that we think they are—is correct,” Cannady says. The findings “give insight into what’s going on in these supernova remnants, and offer a way to understand the galaxy and these sources in the galaxy better.”

The results however do not prove this. Nor do they eliminate the possibility that cosmic rays might also come from other sources outside our galaxy. At present the data is simply too uncertain.

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Intuitive Machines will attempt to launch 3 lunar landing missions in 2024

8:52 am

South Pole of Moon with landing sites

According to the company’s CEO, Intuitive Machines is pushing to fly two more Nova-C lunar landing missions next year after its first is launched by SpaceX on January 12th and hopefully lands successfully near the Moon’s south pole on January 19th.

Intuitive Machines is working on two more Nova-C landers for its IM-2 and IM-3 missions, also carrying NASA CLPS payloads. The company has not announced launch dates for those missions, but Altemus said he hoped both could take place by the end of 2024.

“We are planning three missions in 2024,” he said, which will depend in part on NASA’s requirements as well as orbital dynamics. Landings at the south polar region of the moon, the target for IM-2, are linked to “seasons” where lighting conditions are optimal for lander operations. IM-3, he said, would happen “a few months” after IM-2.

Though Nova-C will launch after Astrobotic’s Peregrine lander (launching on ULA’s Vulcan rocket), it will get to the Moon quickly, and will attempt its landing first. If successfully it will therefore be the first private payload to do so.

The company’s ambitions for 2024 are laudable, but depend so entirely on everything going perfectly it will not be surprising if they do not pan out. Nor will it reflect badly on the company if just one mission flies in 2024. Landing a robot on another world is hard. For private companies to do it is harder.

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The caldera wall of a Martian giant volcano

12:12 pm

The caldera wall of Pavonis Mons
Click for original image.

Cool image time! The picture to the right, rotated, cropped, reduced, and enhanced to post here, was taken on June 8, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows the top half of the northwestern interior wall of the central caldera of Pavonis Mons, the center volcano in the string of three giant volcanos found in Mars’ equatorial regions.

The elevation change from the top to the bottom of this picture is about 7,000 feet, though this covers only half the distance down to the floor of the caldera. The picture was taken as part of a survey of this caldera wall.

Volcanic activity here is thought to have ended more than a billion years ago. Thus we are looking at relatively old terrain that has had many eons to be reshaped since the last eruption.
» Read more

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Curiosity looks back at Gale Crater one last time before month-long communications break

11:11 am

Looking back at Gale Crater
Click for image.

Overview map
Click for interactive map

Though the view has not changed much since early October, when I last posted a Curiosity navigation image looking out across Gale Crater from the present heights of Mount Sharp, today’s image above, taken on November 8, 2023, sol 4001 since the rover landed on Mars, signals the beginning of the monthlong solar conjunction, when all communications with Mars is blocked because the Sun has moved between the Earth and the Red Planet.

Solar conjunction occurs every two years, with this being the sixth conjunction experienced by Curiosity. It officially began on November 6th and is expected to end around November 29th. The picture above however was obtained two days into that conjuction, and is unusual in that it does not have the large drop-outs now seen in many other images taken then, both from Curiosity and Perseverance. We should expect there to be very few additional images before the end of November.

The blue dot in the overview map to the right shows Curiosity’s present position, with the yellow lines indicating roughly the area covered by the picture above. The crater rim is about 20 to 25 miles away, with the peak of Mount Sharp about the same distance away in the opposite direction. The rover has climbed about 2,500 feet, but it still sits about 13,000 feet below the mountain’s peak. Though the photo encompasses Curiosity’s entire route since landing, most of it is out of sight, the lower flanks of Mount Sharp blocking our view.

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The strange craters in the high northern latitudes of Mars

11:59 am

The strange craters in the Martian northern lowlands
Click for original image.

Cool image time! The picture to the right, rotated, cropped, reduced, and enhanced to post here, was taken on August 22, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). I have also inserted data from a July 28, 2008 context camera image into the blank strip that now exists in the center of high resolution camera images due to the failure of one sensor.

This photo is what the camera team calls a terrain sample, and was probably taken not as part of any specific request but to fill a gap in the camera’s schedule in order to maintain its proper temperature. When the camera team does this they try to find locations that either have not been observed in much detail previously or have interesting features. In this case the team accomplished both. The interesting features are the two pedestal craters, both surrounded by splash aprons. Neither has been observed in high resolution previously, and the context camera has only taken two pictures of this location in total.
» Read more

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Strange meandering ridge amidst Martian glaciers

12:21 pm

Overview map

Strange meandering ridge in glacier country

Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on June 21, 2023 by the high resolution camera on Mars Reconnaissence Orbiter (MRO). Its focus is the meandering ridge in the center of the picture, which the scientists intentially describe vaguely as a “ridged flow-like feature”.

The elevation difference between the high and low points within the picture is about 500 feet, though most of that slope occurs in the lighter terrain on the right. The darker area where the ridge is located has no clear elevation trend, though there are hints of depressions and rises within it.

The yellow dot on the overview map above marks this location, deep within the chaos terrain dubbed Deuteronilus Mensae, on the western end of the 2,000 long northern mid-latitude strip I dub glacier country, because practially every image from there shows glacial features.

To underline this fact, the red and white dots mark previous cool images from 2020 and 2021, with the first showing an eroded glacier and the second glacial ice sheets.

The mesa to the east of this picture rises more than 6,000 feet to its peak, as indicated by the black dot. This is also the highest point for this entire grouping of mesas. All are surrounded by a single large apron of material, likely a mixture of alluvial fill and ice.

What however caused the narrow ridge in the picture above? Is it ice or bedrock? If ice why is it so different than the glacial material that seems to surround it? If bedrock, it suggests it is instead an ancient inverted channel created when that ridge was a canyon through which ice or water flowed, compacting the canyon floor. When the terrain around it eroded away it was more resistent and became a ridge instead.

I have no answer. The colors suggest the ridge is rock, not ice, but that is not conclusive.

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Lucy: Dinkinesh’s moon is actually a contact binary

8:42 am

Dinkinesh's contact binary moon
Click for original image.

As more images have arrived from Lucy’s fly-by of Dinkinesh scientists have discovered that its moon is actually a contact binary.

The Lucy picture to the right, cropped, reduced and sharpened to post here, shows that contact binary on the right.

This image shows the asteroid Dinkinesh and its satellite as seen by the Lucy Long-Range Reconnaissance Imager (L’LORRI) as NASA’s Lucy Spacecraft departed the system. This image was taken at 1 p.m. EDT Nov. 1, 2023, about 6 minutes after closest approach, from a range of approximately 1,010 miles. From this perspective, the satellite is revealed to be a contact binary, the first time a contact binary has been seen orbiting another asteroid.

Data from the fly-by is still being downloaded.

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The grand Valles Marineris of Mars

11:30 am

The grand canyon of Mars
Click for original image.

Time for another cool image of the grand canyon of Mars, Valles Marineris. The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on May 24, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows a small section of the floor of this gigantic canyon, where orbital data has detected light-toned materials. From the caption:

Many of the Valles Marineris canyons, called chasmata, have kilometer-high, light-toned layered mounds made up of sulfate materials. Ius Chasma, near the western end of Valles Marineris, is an exception.

The light-toned deposits here are thinner and occur along both the floor and walls, as we see in this HiRISE image. Additionally, the sulfates are mixed with other minerals like clays and hydrated silica. Scientists are trying to use the combination of mineralogy, morphology, and stratigraphy to understand how the deposits formed in Ius Chasma and why they differ from those found elsewhere in Valles Marineris.

The picture however gives no sense of the monumental terrain that surrounds it.
» Read more

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Japan delays asteroid mission due to its rocket problems

9:02 am

Japan’s space agency JAXA has decided to delay its Destiny+ mission to the asteroid Phaethon until 2025 due to the continuing problems getting its Epsilon-S rocket off the ground.

Epsilon-S is intended as an upgrade to Japan’s Epsilon rocket, but its development has been plagued by failures. In October ’22 there was a launch failure of Epsilon, and in July ’23 the second-stage solid-fueled motor of Epsilon-S exploded during a test.

Phaethon is the parent asteroid of the Geminid meteor shower that occurs each year in December. According to the original plan Destiny+ would have done its fly-by of the asteroid in 2029. No new arrival date has been announced.

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Martian lava that buried a crater

5:21 pm

Martian lava flow through crater
Click for original image.

Cool image time! The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on June 24, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows a lava flow that cut through an older 2-mile-wide crater, mostly burying it as it burst through the crater’s southwest and northeast rims. From the caption:

A lava channel extends from the feature and continues 60 kilometers to the northeast, growing deeper along its path. The circular formation is likely an eroded impact crater whose walls have been breached by the lava as it surrounded the rim and then infilled the crater. Alternatively, it could represent the location of a volcanic vent that sourced some of the lavas that formed the channel.

» Read more

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Galaxies within galaxies within galaxies

9:54 am

Galaxies within galaxies
Click for original image.

Time another cool galaxy image! The picture to the right, cropped, reduced, sharpened, and annotated to post here, was taken by the Hubble Space Telescope as part of a survey project of galaxies where past supernovae had occurred. From the caption:

The location of this faded supernova was observed as part of a study of multiple hydrogen-rich supernovae, also known as type II supernovae, in order to better understand the environments in which certain types of supernovae take place.

Though the picture’s resolution was reduced to post here, I have also included insets at the full released resolution of three of background galaxies, one of which (on the uppermost right) appears to have a second smaller galaxy either associated with it or is another background galaxy even farther away. Such background galaxies are always seen Hubble images, which starkly tell us that the universe is far vaster than we can imaging, with more stars than we can conceive.

The galaxy featured here is interesting in its own right. Though it appears to be a spiral galaxy, its arms are very indistinct, suggesting that is sits between that of an elliptical galaxy (no arms, just a cloud of stars) and a spiral (with well-defined arms).

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Ingenuity completes very short 65th flight

2:31 pm

Overview map
Click for interactive map.

Ingenuity yesterday completed a very short 48 second flight that shifted its position only slightly to the west, by about 23 feet. The distance, time, and highest elevation (33 feet) matched the flight plan exactly.

The green dot on the overview map above indicates its present position, with the blue dot marking Perseverance’s location. This particular flight was so short that it actually fits entirely within that green dot. Furthermore, the helicopter’s next flight, scheduled for today as well, is intended to also only reposition the helicopter, but even less so, moving only two feet or so sideways while rising only ten feet.

It appears the engineering team is preparing the helicopter for the upcoming solar conjunction, when the Sun will be between the Earth and Mars and no communications will be possible for several weeks. Such conjunctions occur about every two years, with this one beginning on November 6th and lasting until November 29th. Getting the helicopter in the right spot during that down time will increase the chances for regaining communications afterward. Since Perseverance acts as a relay station, Ingenuity must get placed in a spot where there is a direct line of communications, blocked by no objects or intevening rise in land.

Note that all the Martian rovers and orbiters are preparing for conjunction right now.

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Mars geology that only makes sense by digging deeper

1:54 pm

Not-so baffling Martian geology
Click for original image.

Today’s cool image is a perfect example of why nothing in science research should ever be taken at face value, without digging a bit deeper. The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on October 5, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).

First an important technical point. Though the electronics unit for one of the camera’s color filters is still not working — causing a blank strip down the center of all black & white images, the camera team has gotten around this problem by inserting in that strip other color filter data, thus creating a complete image as you see to the right. This work-around means that MRO’s capabilities, though showing signs of age, will continue almost as good as before.

As for the image itself, when I first looked at it, I was baffled by the striking contrast between the mottled and rough ground in the lower left, and the almost featureless and smooth terrain everywhere else. Why this sudden transition? What could cause it? That inexplicable contrast demanded I post it as a cool image.
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Hubble snaps an ultra-violet view of Jupiter

9:59 am

Jupiter in ultra-violet

Cool image time! Using the Hubble Space Telescope, scientists have taken a false-color ultra-violet image of Jupiter. That picture is to the right, cropped, reduced and sharpened to post here.

This newly released image from the NASA Hubble Space Telescope shows the planet Jupiter in a color composite of ultraviolet wavelengths. Released in honor of Jupiter reaching opposition, which occurs when the planet and the Sun are in opposite sides of the sky, this view of the gas giant planet includes the iconic, massive storm called the “Great Red Spot.” Though the storm appears red to the human eye, in this ultraviolet image it appears darker because high altitude haze particles absorb light at these wavelengths. The reddish, wavy polar hazes are absorbing slightly less of this light due to differences in either particle size, composition, or altitude.

The data used to create this ultraviolet image is part of a Hubble proposal that looked at Jupiter’s stealthy superstorm system. The researchers plan to map deep water clouds using the Hubble data to define 3D cloud structures in Jupiter’s atmosphere.

By comparing this ultra-violet image with Hubble’s optical view as well as Webb’s infrared view, scientists can study Jupiter’s atmosphere much like meteologists study the Earth’s, using multi-wave satellite observations.

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