Questions tagged [planetary-atmosphere]

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21
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2answers
2k views

Why is there so little nitrogen in the Martian and Venusian atmospheres?

Why don't our neighbors have much nitrogen? You would think that, without 'nitrogen-fixing' organisms and such, there might be more.....
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0answers
27 views

Magneto tail effect on the other planet in a binary planet system

Let's say there are 2 earth sized planets orbiting each other around 750,000km apart and at a distance of roughly 1.2 AU from a sunlike star with a mass of 1.105 solar masses. Since they are binary, ...
6
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2answers
450 views

Why do the upper-atmosphere clouds of Venus appear to have that V shape?

IF I understand correctly, the atmosphere moves in the same direction as the rotational spin, but about 60 times faster. It is driven from the hot side of Venus to the cold side (the difference being ...
3
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2answers
228 views

Why is Saturn invisible in this radar image of its rings?

The image below is from Radar imaging of Saturn’s rings Nicholson, P. D. et al., Icarus 177 (2005) 32–62, doi:10.1016/j.icarus.2005.03.023 and discussed further in this answer to How did Arecibo ...
1
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1answer
135 views

How thick was Earth's primordial atmosphere?

Earth's first atmosphere was made of hydrogen and helium accumulated before fusion started in the Sun. As soon as this happened it was stripped away by the Sun. How many atm of hydrogen and helium had ...
2
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2answers
88 views

Do we know of any tidally-locked planets with atmospheres?

If not, is there any reason such a planet couldn't exist? I ask only because that planet would literally have a twilight zone and I want to know that that's a thing somewhere.
2
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1answer
90 views

Why are cirrus clouds more common on Mars?

Mars water ice clouds are often associated with regional- to-global circulation and saturation conditions, as opposed to local convective overturning, and so typically exhibit cirrus rather than ...
3
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1answer
164 views

Any information on the salt content of Mars' atmospheric dust?

Answers to and comments on How to drink water on Mars? suggest that one would not want to drink melted water ice obtained from exposed surface deposits near the poles because it may contain various ...
12
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1answer
315 views

How would astronomical seeing on Mars differ from that on Earth?

Astronomical seeing is the limiting factor for the resolution of all but the smallest Earthbound telescopes. Source Stunning advances in adaptive optics (along with it's predecessor speckle ...