Mars Was Hit By a Lot of Protoplanets Early in its History, Taking Longer to Form than Previously Thought.

There are around 61,000 meteorites on Earth, or at least that’s how many have been found. Out of those, about 200 of them are very special: they came from Mars. And those 200 meteorites have been important clues to how Mars formed in the early Solar System. We know that Mars was a very different …

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