Questions tagged [mars]

Questions regarding Mars, the fourth planet from the Sun.

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3
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2answers
117 views

What if a global killer hit Mars?

Compared to the effects an impact of a global killer would have on Earth, what if such an asteroid, with a diameter around 7 miles (11.2 km), impacted the red planet with its different atmosphere, ...
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770 views

Is the Object in this Photo Mars?

A little bit of context: I dabble in amateur astronomy, however only very lightly. I originally wanted to make some observations of Mars because I know it is supposed to be very close these days but ...
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1answer
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How to view the surface of Mars with a 130 mm Newtonian?

I bought a Celestron AstroMaster 130EQ telescope, but I am not able to see the surface of Mars through using the 10 mm eyepiece. Instead I only see a glowing dot. What should I do to view the mars ...
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Could any known, living organisms on Earth survive on Mars?

No life has been discovered outside of Earth (yet?), but do we know if anything that would be considered "living" on Earth could conquer Mars? (or maybe Venus?) With the Mars One project on the way, ...
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755 views

How do scientists know that a rock found on Earth came from Mars?

There are many documented cases of meteorites being reported as from Mars. http://en.wikipedia.org/wiki/Allan_Hills_84001 While I can understand that it's possible to know if a rock originated as a ...
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1answer
224 views

Kepler and the Sun position

When Kepler went to Tycho Brahe, he learned that Tycho Brahe was using the mean position of the sun to note down the position of Mars. Well, Kepler needed to convert these datas of Brahe to do his own ...
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1answer
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Which planet is this (if any)?

I live in Ahmedabad, in India, with an exact location of about 27.2048° N, 77.4975° E. Currently (as of this writing), it is 20:52 EST. I noticed a red object in the sky. (Forgive the crude imaging. ...
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Are there lightning bolts on Mars?

Although the Martian atmosphere is thin, there are many atmospheric phenomena that occur on Mars: storms, dust devils, (carbon dioxide) snow,... Some storms even stir up the atmosphere of the entire ...
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1answer
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Is dust the only reason why the Martian sky is so bright?

The atmospheric pressure on the surface of Mars is 0.00609 atm on average and 0.012 atm at most in the Hellas Basin. On Earth, at these pressures, which are found at altitudes about 30-35 km (19-22 mi)...
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What is the temperature 55 km beneath the surface of Mars?

What is the temperature 55 km (34.18 miles) beneath the surface of Mars? The reason I ask is that I want to know if it might be habitable for a possible future colony if they could dig that deep (...
9
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1answer
444 views

When was the last volcanic eruption on Mars?

There are several volcanoes on Mars, including Olympus Mons, the largest volcano in the solar system, the volcanoes on the Tharsis bulge,... But they are all thought to be inactive now. When did the ...
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560 views

Could Mars have oil?

What events could have to happen to Mars (which is thought to once look like Earth) that may have depleted the atmosphere and erase all proof of life ever existing at least on the surface? I know an ...
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Could a magnetars magnetic field have saved Mars atmosphere?

Just wondering: if a magnetar was close enough to Mars would it have saved its atmosphere by protecting it from solar radiation? I was wondering this because Earth protects us via a magnetic field; ...
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Is the curvature of Mars visible from the top of Olympus Mons?

Would you be able to see the curvature of Mars from the top of Olympus Mons? And how much curvature would you see if it was visible, would it be only barely detectable, or would you see a lot of ...
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194 views

Could martian meteorites come from Olympus Mons?

Could Olympus Mons have thrown ejecta out of Mars' orbit when it was active? Does it fit with the composition and dating of meteorites with martian origin?
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Why did the edge of Olympus Mons collapse?

On Earth, the maximum height for a mountain is ~10 km. Beyond that, the mountain will start to spread or collapse. On the surface of Mars, the gravity is not as strong, so the maximum height for a ...
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1answer
935 views

Why did Mars lose its magnetic field?

I had heard that Mars once had a planetary magnetic field, but that it is now gone? What happened to it?
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Who coined the phrase “martian dichotomy”?

This question is adjacent to this other one. The martian dichotomy refers to the fact that the northern and southern hemisphere are radically different on Mars, with different surface ages and ...
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Does the axial tilt of Mercury and Venus vary?

The axial tilt of Mars varies greatly over time, with a tilt varying between 15 and 25° over the last million years, and varying even more over the last 5 million years. The Earth's tilt on the other ...
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When was the martian dichotomy first observed?

The North and South hemispheres of Mars are very different one from another. They have different elevations, different crust thickness, different surface ages. This is known as the martian dichotomy. ...
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64 views

What is 'surface acceleration' of a planet or other body? As opposed to its 'g' (gravity)?

The Mars Fact Sheet at NASA (their NSSDC or NSSDCA section, whatever that means) lists a value for 'surface acceleration' just below one for 'surface gravity'. They also have the values for Earth, ...
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How many quakes have been detected by Insight?

Insight has been on Mars with its seismometer for almost two years now. Has it detected any mars-quakes yet? How often do these quakes seem to occur? Is there a website where the current number of ...
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50 views

Could life forms have travelled between the Earth and Mars on meteoroids?

Mars meteorites have been found on Earth, and there likely are Earth meteorites that have crashed on Mars. If you take any random piece of rock from the surface of Earth, the odds are there will be ...
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1answer
43 views

What are the most recent minerals modified by water found to date on Mars?

There likely was quite a bit of liquid water on the surface of Mars less than 4 billion years ago. We know this because we found rocks that old that have been modified by the presence of water. For ...
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How to retrieve from NASA Horizons site the needed data to plot analemmas for other planets?

I posted such a question in space.stackexchange ( https://space.stackexchange.com/questions/46077/which-are-the-correct-input-parameters-for-nasa-horizons-query-to-get-the-right?noredirect=1#...
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How can one determine the angle between the line of nodes and the major axis of the orbit of Mars?

Edit: What I really was looking for, was the difference in longitude on the orbit of Mars between its aphelion and the point where the north pole axis of Mars would point towards the Sun (northern ...
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How to see Mars and Venus in color?

My telescope is Arsenal - Synta 70/700 AZ2 (refractor model). 140x max zoom (10 mm with Barlow). I could clearly see Jupiter and Saturn in color. I even saw brown stripes on Jupiter. Yet, when I tried ...
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How did the orbits of Phobos and Deimos circularize?

The satellites of Mars might be captured asteroids. But Phobos has an eccentricity of $0.015$, and Deimos of $3\times10^{-4}$. If they were captured, they likely were captured with rather eccentric ...
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How old are the Martian blueberries?

The martian blueberries (only blue in false color) found by the Opportunity rover in Meridium Planis are formed by slow evaporation in mineral-rich liquid water. They obviously formed early in the ...
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1answer
57 views

Has any of the orbiters or rover on Mars captured image of comet NEOWISE?

We are seeing stunning pictures of comet NEOWISE from earth (and ISS too), are there any pictures captured from Mars by an orbiter or rover, or any other spacecraft?
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Age of Jezero crater on Mars

How long ago the Jezero crater was formed on Mars? And is it a meteorite impact crater?
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570 views

Where did Mars' water go?

Many sources indicate that there is ice water on Mars today, but it is mainly traces, here and there, but not that much. However, solid hypothesis state that there were oceans on Mars, see Wikipedia'...
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Why wouldn't massive torrents freeze on Mars?

I am currently reading the Cambridge Guide to the Solar System. In chapter 8, section 8.7, they explain that massive torrents of water created outflow channels on the surface of Mars in the past. The ...
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Is there permanent dry ice on Mars? [duplicate]

Are there any places featuring permanent dry ice (carbon dioxide ice) on Mars? Is there dry ice at the poles?
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Ice filled craters on Mars

How many craters on Mars have ice in them and which ones have permanent ice? I could only find Korolev and the unnamed one - strange for such a remarkable crater. http://www.esa.int/...
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1answer
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Eclipses on Mars

This amazing video shows an annular eclipse of the Sun by Phobos as seen from Curiousity. This one shows an eclipse by Deimos. My question is do these things ever both happen at once? Do you ever get ...
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How to easily find out the periods when a planet gets into retrograde?

How to easily find out the periods when a planet gets into retrograde? for eg I want to find out all the periods, in last 5 thousand years, when mars goes into retrograde in Sidereal Scorpion? Is ...
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1answer
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Is it possible to find what crater the Mars meteorites come from?

A few dozen meteorites have been determined to come from Mars. These meteorites likely formed from three separate events. Each one of these events must have created a big enough crater that rocks ...
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Why are Mars northern/southern hemisphere altitudes so different?

I'm looking at the Mars topography map: original link ...and I can't shake the impression that someone just messed up the placement of the center point of the planet, shifting it about 8km north ...
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Has the inclination of the orbital plane of Phobos and Deimos followed that of Mars' axial tilt?

Phobos and Deimos are very close to Mars' equatorial plane (the inclination of their orbits is roughly 1°). The axial tilt of Mars has changed a lot over time, and might have had a inclination of over ...
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1answer
64 views

Retrograde Motion: Stars in the background

I was reading about the retrograde motion of Mars. All explanations give reference to the stars in the background. But I do not understand why this is necessary. I say this since stars themselves also ...
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1answer
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Retrogradation movement of planet Mars relatively from Earth by Copernic

I have a simple question : on the following figure: I don't understand on the right figure why there is a progressive shift on the right when we start from step 1) to step 9). I guess there is an ...
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Why does Hellas Basin look white on some maps?

One map of Mars I see a lot is this colourized map: the Viking colourized global mosaic: (Source) But one thing which strikes me as odd is just how white the Hellas Basin is (the white patch which ...
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184 views

Are there Earth rocks on Mars?

Certain meteorites found on Earth have been established to come from Mars: a giant impact ejected rocks from Mars, these rocks traveled through interplanetary space, and went through the Earth's ...
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How many meteorites have been found some place other than Earth? Where is an authoritative list maintained?

Backgound: After seeing this tweet by astronomer Kacper Wierzchoś about our not-so-new but at least newly-discovered "mini-moon" I scrolled down and saw the tweeted image below. The object is the ...
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Kepler - Creating the Ellipse (Astronomia Nova)

In Chapter 58 in Astronomia Nova, Kepler made his final step to finally create the ellipse (for the orbit of planets) http://science.larouchepac.com/kepler/newastronomy/part4/58/index.html In the ...
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1answer
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When and how was the length of a Mars year determined?

I guess it is known for a long time that Mars has an orbital period of around 687 days. But when and how was this determined?
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How will planets behave in the night sky as seen by Mars colonists?

Certainly among the first colonists on Mars there will be a few people interested in Astronomy enough to enjoy the night sky. For them, familliar Mars will be missing and there will be a new, ...
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Is it possible to revive the Mars geodynamo? [closed]

I’ve done a bit of reading and have found multiple theories suggesting how the Mars geodynamo stopped fully working. This site suggests that one possibility could be volcanic activity ejecting water ...
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1answer
168 views

Does rusty iron on Mars have tetanus? [closed]

Since the surface of Mars is covered with lots of iron and became red because of rustiness of iron, Source from: live.mrf.io if we do have plan to live there, can we get tetanus on those rusty thing?...