Mars is the 4th planet from the sun. It is a terrestrial planet which means that it has a hard rocky surface that you could walk on.
Mars’ surface
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Mars is the 4th planet from the sun. It is a terrestrial planet which means that it has a hard rocky surface that you could walk on.
Mars’ surface
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How Small is Mercury? Astronomy Book for Beginners | Children's Astronomy Books
byBaby Professor