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 Post subject: Re: Mars Thread?
PostPosted: Thu Mar 30, 2017 5:52 pm 
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Two for the price of one in the 100th comment of the Mars thread, and they're related.

MAVEN Findings Reveal How Mars' Atmosphere Was Lost to Space

http://www.astrowatch.net/2017/03/maven ... -mars.html

Quote:
The early Sun had far more intense ultraviolet radiation and solar winds, so atmospheric loss by these processes was likely much greater early in Mars' history, and these processes may have been the dominant ones controlling the planet's climate and habitability, according to the team. It's possible that microbial life could have existed at the surface early in Mars' history. As the planet cooled off and dried up, any life could have been driven underground or forced into occasional or rare surface oases.


There’s Mysteriously Large Amounts of Methane on Mars

http://nautil.us/blog/theres-mysterious ... ne-on-mars

Quote:
Surprisingly, during a single two-month period, four sequential observations reported a spike of 7 ppbv. These values were much too high to explain by comets, meteorites, or dust. They must have been of Martian origin—perhaps a burp from a relatively small and localized subsurface source to the north of the landing site. The Martian winds would blow that methane away over several months, explaining why the signal went away when it did. Alternatively, that pulse could be from a distant and much bigger source, which would require some other unknown mechanism to remove methane quickly. Like the earlier observations of plumes, the spikes seen by Curiosity remain a tantalizing clue to a still-enigmatic Mars.

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 Post subject: Re: Mars Thread?
PostPosted: Tue Apr 04, 2017 12:47 pm 
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What Currency Will We Use On Mars?

https://www.inverse.com/article/29905-m ... n-currency

Looks like a cryptocurrency.

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 Post subject: Re: Mars Thread?
PostPosted: Wed Apr 05, 2017 10:27 am 
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What Makes A Good Landing Site on Mars?

https://www.theatlantic.com/science/arc ... te/521715/

There's no mention of studiously ignoring the spots most likely to be interesting or actually harbor life.

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 Post subject: Re: Mars Thread?
PostPosted: Thu Apr 06, 2017 6:45 am 
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Much ado about nothing: In curious Mars image, NASA asks 'Is that an impact crater?'

https://www.cnet.com/news/mars-nasa-imp ... outh-pole/

WARNING AUTOPLAY VIDEO

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 Post subject: Re: Mars Thread?
PostPosted: Sat Apr 08, 2017 9:09 pm 
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NASA unveiled new plans for getting humans to Mars, and hardly anyone noticed

http://www.planetary.org/blogs/jason-da ... eiled.html

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There is indeed a plan to put humans on Mars. Vague? Yes. Hard to see? Absolutely. But that's because Gerst and NASA are playing the long game. And right now, it may be the only game they can play.

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 Post subject: Re: Mars Thread?
PostPosted: Sat Apr 15, 2017 4:27 pm 
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Forget About Terraforming Mars. Here's Why.

https://www.seeker.com/space/planets/fo ... -heres-why

Quote:
The new analysis indicates that about 2/3 of the argon that was ever in the Martian atmosphere was lost to space through sputtering. Because CO2 can be lost through other processes, the investigators concluded that a larger fraction of the CO2 was removed.

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 Post subject: Re: Mars Thread?
PostPosted: Mon Apr 17, 2017 5:18 pm 
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From the latest xkcd.

Image

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 Post subject: Re: Mars Thread?
PostPosted: Mon Apr 24, 2017 10:21 am 
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Rover's Landing Hardware at Eagle Crater, Mars

https://www.jpl.nasa.gov/spaceimages/de ... d=PIA21494

Quote:
Eagle Crater is about 72 feet (22 meters) in diameter, at 1.95 degrees south latitude, 354.47 degrees east longitude, in the Meridiani Planum region of Mars. The airbag-cushioned lander, with Opportunity folded-up inside, first hit Martian ground near the crater, then bounced and rolled right into the crater. The lander structure was four triangles, folded into a tetrahedron until after the airbags deflated. The triangular petals then opened, exposing the rover. A week later, the rover drove off (see PIA05214), and the landing platform's job was done.


Annotated photo:

https://photojournal.jpl.nasa.gov/figur ... 4_fig1.jpg

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 Post subject: Re: Mars Thread?
PostPosted: Wed Apr 26, 2017 3:35 pm 
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Scientists Discover Lull in Mars’ Giant Impact History

http://www.astrowatch.net/2017/04/scien ... giant.html

Quote:
“The new results reveal that Mars’ impact history closely parallels the bombardment histories we’ve inferred for the Moon, the asteroid belt, and the planet Mercury,” Bottke said. “We refer to the period for the later impacts as the ‘Late Heavy Bombardment.’ The new results add credence to this somewhat controversial theory. However, the lull itself is an important period in the evolution of Mars and other planets. We like to refer to this lull as the ‘doldrums.’”

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 Post subject: Re: Mars Thread?
PostPosted: Fri May 12, 2017 11:08 am 
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Ancient Mars impacts created tornado-like winds that scoured surface

http://keoler.com/ancient-mars-impacts- ... ed-surface

Quote:
They show that tornado-like wind vortices created by crater-forming impacts and swirling at 500 miles per hour or more, scoured the surface and blasted away dust and small rocks to expose the blockier surfaces beneath.

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 Post subject: Re: Mars Thread?
PostPosted: Fri May 12, 2017 4:10 pm 
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Mars May Have Been Born in the Asteroid Belt

https://www.seeker.com/space/planets/ma ... eroid-belt

Quote:
In this case, the team tested their hypothesis about Mars' formation by running simplified computer scenarios of the formation of the terrestrial, or rocky, planets, and also looked at samples from Earth, Mars, the moon, and Vesta, which is an asteroid. "We looked for Mars analogs that accreted material in a portion of the disc which Earth did not, and we concluded that the only way to do this is to form Mars far from the Sun, in the inner asteroid belt," Brasser wrote.

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 Post subject: Re: Mars Thread?
PostPosted: Mon May 15, 2017 11:00 am 
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Why Colonizing Mars Depends on Making Food Taste Better in Space

https://www.thrillist.com/eat/nation/ma ... mfort-food

Quote:
According to retired US astronaut Clay Anderson -- who's done two separate stints on the International Space Station, totaling more than 150 days -- a home-cooked meal or another emotional crutch during a particularly vulnerable stretch could be the difference between sanity and hysteria in space. "During all those hours, all those days, with crewmates and activities going on around the clock," he said during a panel at SXSW this year, "I could have used a beer every once in awhile."

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 Post subject: Re: Mars Thread?
PostPosted: Wed May 17, 2017 9:57 pm 
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How hard did it rain on Mars?

http://www.astrowatch.net/2017/05/how-h ... -mars.html

Quote:
But in their new study, geologists Dr. Robert Craddock and Dr. Ralph Lorenz show that there was rainfall in the past – and that it was heavy enough to change the planet’s surface. To work this out, they used methods tried and tested here on Earth, where the erosive effect of the rain on the Earth’s surface has important impacts on agriculture and the economy.


And semi-related, Bob Dylan.

https://www.youtube.com/watch?v=T5al0HmR4to

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 Post subject: Re: Mars Thread?
PostPosted: Sat May 20, 2017 8:22 am 
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Von Braun Mars Expedition - 1952

http://www.astronautix.com/v/vonbraunma ... -1952.html

Quote:
Das Marsprojekt was the first technically comprehensive design for a manned expedition to Mars. Von Braun envisioned not a simple preliminary voyage to Mars, but an enormous scientific expedition modeled on the Antarctic model. His Mars expedition was to consist of 70 crew members aboard ten spacecraft - each spacecraft with a mass of 3720 metric tons! To assemble this armada in earth orbit, Von Braun proposed a fully recoverable, reusable three-stage launch vehicle, which was designed to deliver 25 metric tons of cargo plus 14.5 metric tons of 'excess propellant' for the Mars fleet with each launch. Assembly of the expedition would take 950 launches of 46 these reusable space shuttles over eight months from a very busy base at Johnston Island in the Pacific Ocean. The first and second stages would splash down under parachutes 304 and 1459 km downrange, then be towed back to the launch site by a tug. The winged third stage, after dumping its cargo at the assembly point and pumping its excess propellants to the Mars ships, would glide to a landing on Johnston Island. All three stages would be refurbished at the island, stacked, and reused.

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 Post subject: Re: Mars Thread?
PostPosted: Thu May 25, 2017 9:08 am 
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Schiaparelli Landing Investigation Completed

http://www.astrowatch.net/2017/05/schia ... ation.html

Quote:
Around three minutes after atmospheric entry the parachute deployed, but the module experienced unexpected high rotation rates. This resulted in a brief ‘saturation’ – where the expected measurement range is exceeded – of the Inertial Measurement Unit, which measures the lander’s rotation rate.

The saturation resulted in a large attitude estimation error by the guidance, navigation and control system software. The incorrect attitude estimate, when combined with the later radar measurements, resulted in the computer calculating that it was below ground level.

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 Post subject: Re: Mars Thread?
PostPosted: Tue May 30, 2017 4:33 pm 
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Mars had water for longer than previously thought

https://www.researchgate.net/blog/post/ ... ly-thought

Quote:
The discovery of light-toned bedrock – called ‘halos’ – with high concentrations of silica in Mars’ Gale crater, reveals that groundwater persisted once the lake in Gale crater dried up. The discovery was made by NASA’s Curiosity rover which traveled more than 16 km over 1,700 Martian days from the bottom of Gale crater to Mount Sharp in the crater’s center. For researchers who published the study in the journal Geophysical Research Letters, it is now a question of whether this extended window of water on Mars enabled life to develop.

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 Post subject: Re: Mars Thread?
PostPosted: Thu Jun 01, 2017 6:12 pm 
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The Small Mars Problem

https://backalleyastronomy.blogspot.com ... oblem.html

Quote:
In more specific terms, mass and radius increase along with distance among the three planets closest to the Sun (Mercury through Earth). Both parameters peak at the orbit of the fifth planet, Jupiter, which is almost a dozen times the radius and more than 300 times the mass of Earth. Then, from Jupiter through Uranus, the seventh planet, both mass and radius decline substantially along with distance from the Sun.

But this orderly progression of planet sizes has two notable interruptions: Mars and Neptune. If the distribution of planets were truly regular, Mars would be larger and more massive than Earth, and Neptune would be smaller and less massive than Uranus. Instead, the Red Planet has only 53% of Earth’s radius (0.53 Rea) and 11% of its mass (0.11 Mea), while the Azure Planet, at 17.2 Mea and 3.9 Rea, has about 98% of the radius of Uranus but 119% of its mass.

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 Post subject: Re: Mars Thread?
PostPosted: Mon Jun 05, 2017 5:24 am 
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NASA Can't Explain What Made This Strange, Deep Hole on Mars

https://www.sciencealert.com/nasa-doesn ... le-on-mars

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 Post subject: Re: Mars Thread?
PostPosted: Mon Jun 05, 2017 7:55 am 
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The image in question:


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 Post subject: Re: Mars Thread?
PostPosted: Mon Jun 05, 2017 3:31 pm 
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Study Suggests Mars Had Ocean, Active Hydrologic Cycle

http://www.astrowatch.net/2017/06/study ... ctive.html

Quote:
Satellites orbiting Mars and rovers on its surface have provided scientists with convincing evidence that water helped shape the planet’s landscape billions of years ago. But questions have lingered over how much water actually flowed on the planet, and the ocean hypothesis has been hotly debated.

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 Post subject: Re: Mars Thread?
PostPosted: Mon Jun 12, 2017 1:41 pm 
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A tartan for martian exploration

https://tartanregister.gov.uk/tartanDetails?ref=11658

Quote:
Designed on behalf of Charles Cockell, Professor of Astrobiology, Edinburgh University, this tartan is intended to be worn during Mars science, exploration and outreach activities. Colours: the red background depicts the surface of Mars, the Red Planet; blue depicts the water-rich past of Mars and the presence of water, mainly as ice, on the planet today; the four green lines represent Mars, the fourth planet from the Sun, the presence of habitable conditions on the planet and the possible future presence of life in the form of human settlement; the thick white line represents the Martian poles, visible from the Earth, a conspicuous and important feature of the planet and its long-term climatic cycles.

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 Post subject: Re: Mars Thread?
PostPosted: Wed Jun 21, 2017 7:16 am 
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NASA Mars Reconnaissance Orbiter views rover climbing Mount Sharp

https://phys.org/news/2017-06-image-nas ... biter.html

aaaand

Mastcam photos from Curiosity taken on the same day

https://mars.nasa.gov/msl/multimedia/ra ... ra=MAST%5F

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 Post subject: Re: Mars Thread?
PostPosted: Fri Jun 30, 2017 11:23 am 
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NASA Seeks Nuclear Power for Mars

https://www.scientificamerican.com/arti ... -for-mars/

Quote:
"It'll be the first time that we operate a fission reactor that could be used in space since [the] 1960s SNAP program," said Lee Mason, who oversees power and energy storage technology development at NASA’s Glenn Research Center in Cleveland.

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 Post subject: Re: Mars Thread?
PostPosted: Wed Jul 05, 2017 12:27 pm 
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Earth and its moon from the surface of Mars.


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 Post subject: Re: Mars Thread?
PostPosted: Thu Jul 06, 2017 5:57 pm 
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Mars covered in toxic chemicals that can wipe out living organisms

https://www.theguardian.com/science/201 ... sts-reveal

Quote:

These tests yielded even more bad news for microscopic Martians: when the bacteria were hit with UV rays in the presence of perchlorates, iron oxide and peroxide, the bugs were killed 11 times faster than with perchlorates alone.


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