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Old Oct 4 2009, 06:17 AM   #4
Master Sneak
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Join Date: Apr 2007
Location: Scotland
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Default Re: New Messenger images of Mercury

Originally Posted by P'ter View Post
To what extent is Mercury a twin of our Moon?
Not at all. It looks like the Moon because it is also a rocky body that has been bombarded and cratered by meteorites for millions of years. But looks can be deceptive: Mercury has a large iron core, which makes it a lot denser than the Moon and gives it a magnetic field.

The Moon is rather like a solid chocolate M&M and Mercury like a peanut M&M. They look the same on the outside, but bite into them and you'll find the inside completely different. (Disclaimer: Don't do this at home. Eating planets can give you indigestion and be bad for your health.)
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