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The study of planets, asteroids, comets, etc, including weather, geology, composition, etc. This tag should be used when the focus of the question is on the the science of a non-Earth non-star natural object, and not used when designing spacecraft to cope with said challenges.

2 votes
3 answers
1k views

How likely is that Europa actually has no ice layer?

We have never landed on Europa, so the assumptions made on a possible ice layer on its surface are made on the data sent by various objects approaching it. I'm sure these assumptions were accurately …
Zoltán Schmidt's user avatar
18 votes
3 answers
7k views

What is the mysterious "Ball of Mars"?

A recent picture of Curiosity rover depicts a surprisingly accurate sphere on the surface of Mars. What is it, and how is it possible that it is so perfecly spherical? Photo by NASA Mars Science Lab …
Zoltán Schmidt's user avatar
20 votes
3 answers
4k views

Why was Titan the first celestial body beyond Mars to be landed on?

If my memories are accurate, then there's only one celestial body beyond Mars, on which any man-made device was landed. Pictures made there are, in fact, quite popular among space fans. But why Titan …
Zoltán Schmidt's user avatar