Tag: science

Perseverance’s possible travel route on Mars

9:06 am

Perseverance's planned driving routes
Click for full image.

In touting the plans of NASA and the European Space Agency (ESA) to someday launch a rover to Jezero Crater designed to pick up the cached samples that Perseverance is going to leave behind, NASA today published the map to the right, showing Perseverance’s planned driving routes in the crater, on the large delta that poured into the crater in the past, and beyond that crater.

The yellow lines indicate Perseverance’s planned route, beginning somewhere in that red landing ellipse. The green lines indicated the many proposed landing sites and pathways the proposed follow-on sample retrieval mission can take to grab Perseverance samples.

The planned route looks like they will spend a lot of time exploring the top of delta, then will move out of the crater and to the southwest towards what had been another candidate landing site for Perseverance, now dubbed the Midway ellipse.

What route the science team will eventually take at the delta depends greatly on exactly where Perseverance lands today. We will know more in only a few hours.

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Hungarian company awarded NASA contract to develop Moon mini-rover

4:49 pm

A Hungarian company has won a NASA contract worth $225K to develop what the company calls its Puli Moon mini-rover.

Named after a Hungarian breed of dog, the Puli rover is a low-cost platform designed to carry different payloads, including the ice water snooper, which won the 2020 “Honey, I Shrunk the NASA Payload” challenge, a competition organised by the U.S. space agency. Weighing less than 400 grammes (14 oz), its purpose is to probe for water ice by identifying and mapping the subsurface hydrogen content of the lunar soil.

The “news article” at the link appears to be a poorly researched article distributed by Reuters that has now been reprinted without changes by such stalwart American mainstream news outlets like the New York Post and MSN.com, to name two. Neither bothered to do any further research.

The article falsely claims that the airplane-based SOFIA telescope recently confirmed there is water on the Moon. It also claims that this rover will be on a lunar mission next year, something that does not seem likely at all.

A look at the company’s website clarifies things. The company competed in a NASA contest offering its design of a very tiny lightweight rover, won, and was then awarded a larger development contract of $225K. No launch is presently set, though if the company is successful in building it for this cost, they will likely get a berth on a later unmanned mission.

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An update on coronavirus from an Arizona doctor

3:09 pm

My personal GP doctor in Arizona, Robert Lending, has for the last year sent out weekly detailed updates to his patients on the on-going COVID-19 epidemic. I thought I provide my readers his carefully researched doctor’s perspective, with his permission of course.

First he updates us on the state of the epidemic in Arizona:

The surge in AZ and in Pima County is over; with dramatic decreases in Cases, Case Fatality Rates (CFR), and Case Hospitalization Rates (CHR). The hospitalization utilizations including beds and ventilators, etc. are markedly decreased. {{{Tucson Medical Center is down to 10.5% Inpatient Covid-19, and they will resume elective surgeries.}}} The initial reductions began before vaccinations, but now may have been helped by the vaccinations. On the other hand, the virus acts as it will; independent of most of society’s attempts to control or modify it, no matter what the politicians and health department officials state. [emphasis mine]

The highlighted text matches what I have been saying for the past year, that the panicky effort to “stop the spread of COVID-19” was foolish, counterproductive, and entirely useless. And the evidence now a year later supports that conclusion. Nothing done by any government anywhere in the world has stopped the virus from spreading, whether it be lockdowns, masks, or quarantines. In the U.S. and Europe especially places that imposed fewer restrictions on their citizens seemed to fare about the same as places where the government stamped down hard. And those former places also had less negative consequences for their economies and for the freedoms of their citizens.

Meanwhile, the evidence is that the epidemic in Arizona is fading. And as far as I can see, during its height it affected almost no one in the general population. Like the flu it impacted the elderly sick the most, but everyone else either didn’t see it at all, or if they got sick they almost always recovered.

Unfortunately, it doesn’t matter that the epidemic is fading and that a vaccine is now available. The unreasonable rules imposed during the panic remain in force, and likely will never go away. And I speak from experience. For example, in trying to schedule an appointment with another doctor, I was told by his office that even if I had tested negative for COVID, received the vaccine, and quarantined myself between its receipt and my appearance at the office, I would still be required to wear a mask.

Think about that. I would be totally healthy and have no symptoms and could in no way transmit the virus, and yet the mask would still be required. We are now a society that irrationally sees all other humans as a threat to be avoided, at all times.

As for the flu, Lending noted some very intriguing data.
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Strange corroding features on Mars

1:02 pm

Strange corroding features on Mars
Click for full image.

Cool image time! The photo to the right, rotated, cropped, and enhanced to post here, was taken by the high resolution camera on Mars Reconnaissance Orbiter (MRO) on October 4, 2020. It shows what appears to be features that are either corroding or eroding away, with the lower areas filled with rippling sand dunes.

The circular features might be ancient craters. The material that partly fills them might be a layer of dust or sand that the wind is slowly blowing away to dig out the depressions along the southern cliff wall.

According to the MRO science team’s interpretation of the colors produced by the high resolution camera [pdf], the dark blue colors here are likely “coarser-grained materials (sand and rocks)”, while the orange-red material on the higher terrain is likely dust.

Could this material be evidence of buried ice eroding away? At first I thought so, and then I took a look at the photo’s location, as shown in the overview image below.
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Watching Perseverance’s landing on Mars

9:51 am

Because it will take eleven minutes for radio communications from Mars to reach Earth, no one on Earth will have any direct contact with the American rover Perseverance as comes in to land in Jezero Crater on Mars on February 18th. When NASA broadcasts the landing here on Earth it will already have happened.

Nonetheless, if you want see as soon as possible if the landing was successful, you can go to NASA public channel here at NASA or here at Youtube. I have also embedded the live stream telecast below the fold in this post.

The landing itself is set for about 3:55 pm (Eastern) on Thursday, February 18th. NASA’s coverage is scheduled to begin at 2:15 pm (Eastern). Expect almost everything you watch to be seeped in NASA propaganda, though of course their overview of the rover, its landing, and its landing site will be informative.

One important note: NASA has been selling the false notion that the primary goal of Perseverance is to search for life on Mars, and sadly much of the mainstream press has been repeating this notion blindly. It is simply not true. The rover’s primary goal, first, last, and always, is to gain more knowledge of the geology of Mars and its past history. If along the way the rover detects evidence of life, all for the better, but that is not what it will be focused on doing during its journey in Jezero Crater.
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New paper: Underlying ice layer seen in Martian gullies at LOW mid-latitudes

2:18 pm

Snow on Mars?
Click to see full image.

In a paper just published, scientists are proposing that bright areas seen in the low mid-latitude gullies on Mars are the underground ice table newly exposed as surface dust is removed.

This paper is a reiteration in more detail of a previous presentation [pdf] by these same scientists at the 2019 the 50th Lunar and Planetary Science Conference in Texas and reported here in March 2019.

The image to the right, from the paper, was taken by the high resolution camera of Mars Reconnaissance Orbiter (MRO) in 2009, and has been cropped to post here. The white streaks are what the scientists propose is that exposed underground ice table. At 32.9 south latitude, this particular gully would be the closest to the equator that such an ice layer has been identified. All the previous ice layer discoveries have been in the ice scarps found at latitudes above 50 degrees. As the paper’s lead author, Aditya Khuller at Arizona State University, explained in to me in an email, “We believe we are seeing exposures of dusty ice that likely originated as dusty snow.” From their paper:

We suggest … that the light-toned materials are exposed H2O ice. … [T]he appearance, and then subsequent disappearance of these light-toned materials, suggests that they are some form of volatile, such as dusty ice, rather than dust alone. … [The appearance] of these light-toned materials is similar to the >100m thick, light-toned ice deposits exposed on steep mid-latitude scarps, indicating that these materials are probably also ice, with some amount of dust on, and within the ice.

The layer would have likely been laid down as snow during a time period (a long time ago) when the rotational tilt of Mars, its obliquity, was much higher than today’s 25 degrees. At that time the mid-latitudes were colder than the poles, and water was sublimating from the polar ice caps to fall as snow in the mid-latitudes.

The overview map below reveals some additional intriguing possibilities.
» Read more

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UAE releases first Al-Amal image of Mars

9:45 am

Al-Amal's first Mars image
Click for full image.

The new colonial movement: The leader of the United Arab Emirates (UAE) yesterday released on his twitter feed the first photo of Mars that was beamed back from its Al-Amal (“hope” in English) orbiter, taken shortly after achieving orbit.

That photo is to the right, cropped and reduced to post here. From the article at the link:

[The photo] was captured by Hope’s EXI instrument from an altitude of 24,700 km (15,350 miles) above the Martian surface at 20:36 GMT on Wednesday – so, one day after arriving at the Red Planet.

The north pole of Mars is in the upper left of the image. At centre, just emerging into the early morning sunlight, is Olympus Mons, the largest volcano in the Solar System. Look right on the boundary between night and day, the so-called terminator.

The three shield volcanoes in a line are Ascraeus Mons, Pavonis Mons, and Arsia Mons. Look east, to the limb of the planet, and you can see the mighty canyon system, Valles Marineris. It’s part covered by cloud.

Right now the spacecraft’s orbit is very eccentric, ranging from 600 to 30,000 miles above the Martian surface. After several orbital trims, Al-Amal will end up in an orbit about 14,000 by about 27,000 miles, with an inclination of about 25 degrees. From that high orbit it will then focus on studying the Martian atmosphere.

Thus, future images will likely be similar to this, global and mostly aimed at tracking visible phenomenon in the atmosphere (dust storms and clouds).

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Rover update: The rovers are coming! The rovers are coming!

12:52 pm

With the imminent landing on Mars of both the American rover Perseverance only days away on February 18th followed by China’s rover in April, I think it time for a new rover update, not only providing my readers a review of the new landing sites but a look at the most recent travels of Curiosity on Mars and Yutu-2 on the Moon.

Curiosity

Curiosity's view of the base of Mount Sharp, February 12, 2021
Click for full resolution image.

Overview map of Curiosity's most recent and future travels

The panorama above, made from four images taken by Curiosity’s right navigation camera on February 12, 2021 (found here, here, here, and here), looks south to the base of Mount Sharp, now only a short distance away. The yellow lines on the overview map to the right show the area this panorama covers. The white line indicates Curiosity’s previous travels. The dotted red line in both images shows Curiosity’s planned route.

The two white dots on the overview map are the locations of the two recurring slope lineae along Curiosity’s route, with the plan to get reasonable close to the first and spend some time there studying it. These lineae are one of Mars’ most intriguing phenomenon, seasonal dark streaks that appear on slopes in the spring and fade by the fall. There are several theories attempting to explain their formation, most proposing the seepage of a brine from below ground, but none has been accepted yet with any enthusiasm.
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Possible exoplanet detected in habitable zone around Alpha Centauri A?

10:47 am

The uncertainty of science: Scientists have detected faint evidence that suggests the existence of a Neptune-sized exoplanet circling the sunlike star Alpha Centauri A.

After analyzing 100 hours of data gathered by NEAR in May and June of 2019, the scientists detected a thermal fingerprint in the habitable zone of Alpha Centauri A. The signal potentially corresponds to a roughly Neptune-size world orbiting between 1 and 2 astronomical units (AU) from the star, study team members said. (One AU, the average Earth-sun distance, is about 93 million miles, or 150 million kilometers.)

But that planet has not yet been confirmed, so it remains a candidate for now.

This result is very uncertain at this moment, so we should constrain our enthusiasm. If true, however, it would signal the possibility of more exoplanets circling the stars of the nearest stellar system. Alpha Centauri is actually three stars, a binary of two sunlike stars circled at great distance by the red dwarf Proxima Centauri. Scientists already think there are exoplanets circling Proxima, with one about the size of Earth.

What makes this particular interesting, if true, is that the exoplanet was detected not by the slight wobble its gravity caused in the star, or by a transit across the face of the star, but by its own light. If the detection is real, this would be I think the first time that an exoplanet has been seen directly, even if that detection comprises a few tiny pixels of light.

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Europa Clipper to fly on commercial rocket, not SLS

11:30 pm

NASA managers have now decided unequivocally to not use SLS to launch Europa Clipper, and will instead choose a commercial rocket in about a year.

During a Feb. 10 presentation at a meeting of NASA’s Outer Planets Assessment Group (OPAG), leaders of the Europa Clipper project said the agency recently decided to consider only commercial launch vehicles for the mission, and no longer support a launch of the spacecraft on the SLS.

“We now have clarity on the launch vehicle path and launch date,” Robert Pappalardo, project scientist for Europa Clipper at the Jet Propulsion Laboratory, said. That clarity came in the form of a Jan. 25 memo from NASA’s Planetary Missions Program Office to “immediately cease efforts to maintain SLS compatibility” and move forward with a commercial launch vehicle, or CLV, he said.

Though this decision was expected following the approval of the most recent congressional budget for NASA, which contained language allowing NASA to abandon SLS if it thought it wise, this decision continues the string of recent stories that all point toward the eventually abandonment of SLS itself.

At the moment the rocket most likely to win the contract is the Falcon Heavy.

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Scientists confirm distance to farthest known solar system object

2:46 pm

Scientists have now confirmed that the large asteroid dubbed Farfarout (about 250 miles across) is presently about 132 astronomical units from the Sun (about 12 billion miles), making it the farthest known solar system object.

Its orbit however is far from circular, and it isn’t presently even at its farthest point in that orbit.

[T]he orbit of Farfarout is quite elongated, taking it 175 au from the Sun at its farthest point and around 27 au at its closest, which is inside the orbit of Neptune. Because its orbit crosses Neptune’s, Farfarout could provide insights into the history of the outer Solar System. “Farfarout was likely thrown into the outer Solar System by getting too close to Neptune in the distant past,” said Trujillo. “Farfarout will likely interact with Neptune again in the future since their orbits still intersect.”

The astronomers expect to discover more such objects in the coming years that will even eclipse this one in distance.

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Inexplicable ridges in Hellas Basin on Mars

2:07 pm

Sinuous ridge in Hellas Basin
Click for full image.

Time for some more cool but mysterious Martian images! The photo to the right, rotated, cropped, and reduced to post here, is the first of two images today, both of which show the ridges but of a completely different nature. Both are located in Hellas Basin in Mars southern hemisphere.

This first picture was taken on September 4, 2020 by the high resolution camera on Mars Reconnaissance Orbiter (MRO), and shows a sinuous complex that resembles to a remarkable extent a set of river tributaries, but is instead a set of raised ridges rather than a canyon system.

Scientists have found more than 10,000 miles of such ridges in the northern hemisphere in Arabia Terra, the most extensive transition zone between the southern highlands and the northern lowlands, and have dubbed them fossilized rivers. From a 2016 press release:

The inverted channels are similar to those found elsewhere on Mars and Earth. They are made of sand and gravel deposited by a river and when the river becomes dry, the channels are left upstanding as the surrounding material erodes. On Earth, inverted channels often occur in dry, desert environments like Oman, Egypt, or Utah, where erosion rates are low – in most other environments, the channels are worn away before they can become inverted. “The networks of inverted channels in Arabia Terra are about 30m high and up to 1–2km wide, so we think they are probably the remains of giant rivers that flowed billions of years ago. Arabia Terra was essentially one massive flood plain bordering the highlands and lowlands of Mars. We think the rivers were active 3.9–3.7 billion years ago, but gradually dried up before being rapidly buried and protected for billions of years, potentially preserving any ancient biological material that might have been present,” added Joel Davis.

Nor are such features on Mars limited to Hellas and Arabia Terra. For a particularly spectacular feature in the cratered highlands see this 2019 post.

The origin of these sinuous ridges in Hellas might have a similar origin as these other fossilized rivers. At present the bottom of Hellas, the deepest basin on Mars, is a place with little signs of ice. In the past there is evidence that lakes once existed here, so we cannot rule out water as a cause.

At the same time, Hellas was formed by a gigantic impact. One cannot dismiss the possibility of a volcanic origin, impact melt left over from the heat of that crash.

Today’s second ridge complex in Hellas looks far different.
» Read more

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