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Questions regarding surface features of celestial bodies.

9 votes
1 answer
1k views

How can one find the cratering rate for different parts of the Solar System

I've heard that counting impact craters is a great way to figure out how old the surface of a planet is, but I've never heard what the actual rates are. Do they vary from planet to planet? Anything el …
PearsonArtPhoto's user avatar
  • 122k
9 votes
1 answer
473 views

What caused Cydonia mesas, such as "The Face on Mars", to be created?

The Cydonia region of Mars is littered with mesas, which are an unusual geographic feature on Mars. A sample of a few of these, including the commonly known as "The Face on Mars", is shown below. How …
PearsonArtPhoto's user avatar
  • 122k
20 votes
2 answers
125k views

What are the dark areas on the moon?

The Moon has a large number of dark spots, as can be seen on the photo below (Wikipedia), that differ significantly from the lighter areas. The dark areas often seem to be roundish, but not exclusivel …
PearsonArtPhoto's user avatar
  • 122k