Questions tagged [mars]

Questions regarding Mars, the fourth planet from the Sun.

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How will NASA perseverance re-enter the earth from Mars

Perseverance has been in Mars since 2021, and I'm just wondering the mechanism through with it will return to earth.
Innocent Friday's user avatar
1 vote
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Is the level of carbon monoxide on Mars at an expected equilibrium level?

Is the level of carbon monoxide in the atmosphere of Mars (0.0747%) exactly what would be expected under equilibrium conditions given the ambient Martian atmospheric temperature, pressure and ...
Slarty's user avatar
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Are the rotational axes of Earth and Mars parallel?

So I was stuck on a question involving the transformation of coordinates from geocentric to Mars-centric coordinates. The relative position of Mars and its orbital details are given. I thought that we ...
Aarush Mishra's user avatar
1 vote
2 answers
56 views

What is the concentration of molecular oxygen in the Martian atmosphere?

In the early 1970's and prior to the Viking landers, T. Owen measured the oxygen in the Martian atmosphere at 0.3%, I believe by doppler shift methodology through the Earth's atmosphere (wow). During ...
Incredible II's user avatar
28 votes
4 answers
6k views

Which is brighter, Mars as seen from Earth, or Earth as seen from Mars?

At their closest flyby, Earth is ‘new’ and dim from Mars, and Mars is ‘full’ from Earth and brightest as seen from Earth. When Earth is 39 degrees from the Sun then Earth is brightest as seen from ...
Mark Besser's user avatar
2 votes
1 answer
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Conditions on Earth when Mars was warmer, wetter & had a thicker atmosphere

To the question, What part of a star's habitable zone has the best chance of developing life?, I made the following comment: It's always intrigued me as to why some people have thought that life in ...
Fred's user avatar
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3 votes
1 answer
115 views

Trouble seeing Mars and Venus more than specks of light

Finally been breaking out the telescope to get a better look at things recently, and have been attempting to take advantage of Mars's and Venus's positions in the sky, but I haven't been able to see ...
BeardedChemist9's user avatar
8 votes
1 answer
201 views

Does Mars get hit by as many meteors as the Earth?

The Moon gets bombarded by meteors at the same rate as the Earth according to What the moon's craters reveal about earth's history Does Mars or any other planet get bombarded at the same rate as the ...
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2 votes
1 answer
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Mars crater nomenclature

The Wikipedia page for planetary nomenclature states that small craters don't follow the same rule as large craters as far . What is the cutoff between small and large craters (as far as naming is ...
usernumber's user avatar
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How could we detect if Venus or mars were being terraformed by aliens? [closed]

If any other body in our solar system was being terraformed by aliens, what would be the ways in which we would detect this? Initially I thought of Venus or mars but I guess this could extend to any ...
Darth Scitus's user avatar
5 votes
2 answers
580 views

Distance from Earth to Mars at time of November 8, 2022 lunar eclipse maximum

I’m looking for the “exact” distance from the Earth to Mars, at the moment of the lunar eclipse maximum earlier this week (November 8, 2022). As many significant digits as you can muster. Between the ...
Bruce Simonson's user avatar
8 votes
3 answers
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How do we know that ice from the S1094b event was from Mars surface and not from the impactor?

The recent news story NASA’s InSight Lander Detects Stunning Meteoroid Impact on Mars, about an impact that occurred on Mars on December 24, 2021 (event S1094b), shows a picture of the impact crater, ...
Jean-Marie Prival's user avatar
1 vote
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What is the elevation of this mesa in Noctis Labyrinthus?

I'm interested in the elevation of this mesa in Noctis Labyrinthus. It's located at -6.3, 265. This image is from https://www.geo.fu-berlin.de/en/geol/fachrichtungen/planet/press/archiv2016/...
Sam Ruhmkorff's user avatar
15 votes
2 answers
3k views

How could Mars' atmosphere be shed by solar winds, when Venus has a thick atmosphere despite no magnetic field?

Our current understanding of how Mars lost its atmosphere is because it lost it magnetic field, due to a barrage of reasons, such as core cooling due to low volume and cooling off quickly. This ...
Furious Arcturus's user avatar
-1 votes
1 answer
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If 16 million kilometers were added to Earth's semi-major axis, what measurable effect would there be on Mars' orbit?

I have some education in astronomy, but nothing extensive in astrophysics. I can follow mathematical procedure with assistance. Procedural responses are most welcome!
JM Yaden's user avatar
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Are the human-made devices on Mars searching for existing life?

According to the answers to my other question - Most powerful microscope on Mars? The microscopes on Mars do not search for life. SHERLOC (Scanning Habitable Environments with Raman & Luminescence ...
Joe Jobs's user avatar
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Would an accumulation of dust in a planet's L1 Lagrange point plausibly obscure it from Earth?

I'm designing a hypothetical newly discovered planet in our solar system that has an ecosystem comparable to Earth's that supports intelligent life. The explanation given for the planet remaining ...
Emeraldminer's user avatar
4 votes
1 answer
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When were Swift and Voltaire discovered?

Deimos -- Mars' smallest moon -- has only two named features: the Swift crater and the Voltaire crater. Based on the Gazetteer of Planetary Nomenclature, their names were approved in 1973. Given the ...
usernumber's user avatar
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3 votes
1 answer
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Most powerful microscope on Mars?

From all the missions sent to the surface of Mars, do any of them have a microscope? If yes, then which one has the most powerful microscope? Is it capable of detecting microbes?
Joe Jobs's user avatar
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-3 votes
2 answers
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Which is closer to the Earth, Phobos, Deimos or Mars? [closed]

Which one is closer to the Earth, Phobos, Deimos or Mars? None of the answers that I find actually answer my question.
Starship - On Strike's user avatar
8 votes
1 answer
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How new is this crater?

I've been looking at HiRISE images, and this description says that this crater is new, which is why we can see the bright ejecta. How long does it typically take for the bright ejecta to erode away? ...
usernumber's user avatar
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17 votes
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On Mars, why are the seasons "strongly amplified" in the southern hemisphere and masked in the northern hemisphere?

In the Darian calendar entry on Wikipedia we read (emphasis mine): The Martian year is treated as beginning near the equinox marking spring in the northern hemisphere of the planet. Mars currently ...
d_e's user avatar
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10 votes
1 answer
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Salinity of Martian water 3.5 Billion years ago

Was Mars' ocean 3.5 billion years ago salt water or fresh water? On a related note: would we be able to drink the water that is on Europa?
Peter U's user avatar
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Earth-Mars-Moon or No Moon Barycenter Orbit Possible?

Could an object of sufficient mass deflect Mars so that it ends up stably orbiting an Earth-Mars-Moon barycenter? What would the distances eventually become between each orbiting body? What if the ...
Frank MacDonald's user avatar
1 vote
2 answers
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Gamma Ray Spectroscopy in detecting hydrogen

My professor explained saying that bombarding the surface with cosmic rays breaks off a few neutrons from nuclei and the nucleus, having undergone a change in energy level, emits a gamma photon. The ...
Ambica Govind's user avatar
10 votes
1 answer
271 views

Longest line of sight on Mars

It is said that the slope of Olympus Mons is so gradual that the peak cannot be seen from the plain; it is hidden by the planet's curvature. That provokes questions: How steep is the steepest of the ...
Anton Sherwood's user avatar
3 votes
0 answers
49 views

Could the timing of the oxygen spike on Mars be used to determine if photosynthesis is responsible?

I am wondering if the timing of the oxygen spike on Mars could be used to determine if photosynthesis is the source (which would be another indication of life on Mars), or if it is purely heat related?...
Jonathan's user avatar
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2 votes
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When will Jezero crater on Mars reach its lowest atmospheric pressure and what pressure will that be?

In the first sols of the Mars 2020 mission the local pressure was something above 750 Pa. It has been decaying since then and is now less than 650 Pa, this is what required Ingenuity's rotorblades to ...
LoveForChrist's user avatar
2 votes
1 answer
350 views

Is it more accurate to measure distances from Mars?

I'm trying to figure out answer to this task: At a certain level of development of the Martian civilization, scientists of this planet began to measure distances. Will their measurements be more or ...
ALiCe P.'s user avatar
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1 vote
1 answer
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How would the surface of Mars compare with the Atacama desert for millimeter wave (and shorter) radio astronomy?

In this answer to What kind of experiments would a scientist do on Mars? I suggest that the resemblance of the ALMA array's site in the Atacama Desert to the surface of Mars suggests millimeter ...
uhoh's user avatar
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2 votes
1 answer
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Mars satellite data similar to Sentinel-2?

For Earth, there is lot of free satellite data easily available. For example, I can download the Sentinel-2 optical images freely from https://scihub.copernicus.eu/. What would be the closest thing ...
user3704545's user avatar
11 votes
1 answer
965 views

How exactly was Giovanni Cassini able to measure the distance to Mars?

Recently learned that Cassini was able to calculate the distance to Mars quite well using parallax in 1672. I was surprised, since even at opposition of Mars, the parallax (with respect to the Earth's ...
d_e's user avatar
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2 votes
1 answer
64 views

Why are all the ejecta blankets in the same direction in this image?

I was browsing the HiRISE images and found this one In this image, there are several craters with an ejecta blanket that is to the left of the crater. How did all the ejecta blankets end up on the ...
usernumber's user avatar
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1 vote
1 answer
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Are there any SuperCam spectra available?

A lot of pictures from the SuperCam, the NavCam or the Mastcam onboard the Perseverance rover are available online (for instance on the NASA and JPL websites). Have any SuperCam spectra been made ...
usernumber's user avatar
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1 vote
1 answer
252 views

What is the maximum speed in which a human jumping away from Deimos and towards Mars would actually fall back down rather than enter Mars' gravity?

Imagine a universe in which Deimos and a human are the only objects in the universe. It doesn't matter if the human jumped even 1 nanometer per second slower than escape velocity, they would still ...
user177107's user avatar
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0 votes
1 answer
132 views

Mars Ecliptic Latitude

It's stated Mars orbital plane is 1.8 degree to the ecliptic. How then can Mars can ecliptic latitude went beyond 1.8 ? Example; Jan 8th 2023, Mars latitude at +2.8. 24th Jan 2025, +4.3. Isn't the ...
emotionallyattached's user avatar
3 votes
2 answers
390 views

...but where did Mars' atmosphere actually GO?

In this answer to How is space a vacuum when there are planets, gases, etc? I mention that most of Mars' original atmosphere was swept away by the solar wind after the planet lost its magnetic field ...
uhoh's user avatar
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3 votes
1 answer
335 views

Is the 'spin' of Earth and the 'spin' of Mars a significant contribution to their angular momentum?

Is the 'spin' of Earth and the 'spin' of Mars taken into account as a contribution to the conservation of angular momentum? (and a contribution to the increasing/decreasing eccentricity?) Or - is the ...
Rob Clennell's user avatar
3 votes
1 answer
202 views

Mars is getting closer to Earth through its elliptical orbit becoming more eccentric. Do Earth and Mars keep getting closer? [closed]

A NASA Mars article says: Mars' orbit is more elliptical than Earth's, so the difference between perihelion and aphelion is greater. Over the past centuries, Mars' orbit has been getting more and ...
Rob Clennell's user avatar
6 votes
1 answer
675 views

Use MOXIE on Earth [closed]

I recently read about a machine called MOXIE that synthesised oxygen from carbon dioxide on Mars. I haven't been able to get the exact idea of how the thing works(though I've noticed analogies to ...
Ambica Govind's user avatar
2 votes
1 answer
110 views

When were the spiders first observed on Mars?

On Mars, there are spider-looking features near the South pole that might be caused by CO2 sublimation. When were these features first observed on the surface of Mars?
usernumber's user avatar
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6 votes
2 answers
330 views

What are the dark spots in the "face of Mars" picture?

In this picture of Cydonia by Viking 1 (taken from this article), there are a bunch of black spots scattered everywhere. Are they an artifact of the image or are they an actual feature on the surface ...
usernumber's user avatar
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8 votes
0 answers
609 views

Black spot in Mars' sky

There is a sequence of three raw images by Mars Curiosity Rover taken during Sol 3066 (22/03/2022, roughly) that show the same features of Mars' landscape and sky. They are separated by 38 seconds' ...
luchonacho's user avatar
4 votes
1 answer
78 views

Earlier references of Mars' arsia mons elongated cloud?

The weird long cloud on Mars is finally revealing some of its secrets is an article by Chelsea Gohd from space.com referencing ESA's Mars Express news. The Arisa Mons Elongated Cloud (AMEC) is ...
B--rian's user avatar
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1 vote
1 answer
151 views

Could ancient tectonic activity on Mars be due to it having oceans of sulphuric acid?

Could Mars' ancient tectonic activity have ceased due to its oceans having been composed of sulphuric acid, which warmed up and evaporated due to the Theia event as ice chunks landed on its surface? ...
user avatar
2 votes
1 answer
251 views

How was Mars' very noticeable change in apparent magnitude explained by the Geocentric Model?

In the geocentric model, the Sun, the Moon, and the 5 naked-eye planets (Mercury, Venus, Mars, Jupiter, Saturn) all orbited Earth. Today we know that the planets orbit the Sun, and thus they come ...
user177107's user avatar
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0 votes
1 answer
121 views

River-like artifact in perseverance rover's photo of Mars

Good to know that perseverance rover has touched the surface of Mars finally. We will have nice new opportunity window for exploring our closest "friendly" planet of solar system. Here's one ...
Agnius Vasiliauskas's user avatar
3 votes
0 answers
84 views

Measured values of the solar irradiance at other values than 1 AU?

It is straight forward to estimate the total solar irradiance of a planet using the Earth's solar constant, and scaling it according to the (mean) distance of the planets. But for which planets have ...
B--rian's user avatar
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3 votes
2 answers
2k views

Planets just look like dots! Beginner telescope, hoping for some advice

I'm very new to astronomy and got myself a cheap, used 700mm 70mm diameter refractor scope and am able to see (what I think are) good images of the moon. However when I try to view planets I see ...
SteddyEddy's user avatar
2 votes
0 answers
73 views

Abundance of penitente ice formations in the solar system

When researching for my question on extraterresitral snow, I learned about a rare snow formation called penitente which seems to be found on various (dwarf) planets, like Earth, Mars, and Pluto. ...
B--rian's user avatar
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