Did Life on Earth Come from Mars?
There’s still controversy over whether the 3.9 billion-year-old Martian meteorite ALH84001, found in Antarctica on December 1984, contains fossilized Martian bacteria. If it does, it’s possible that life came to Earth from Mars and that we are all, in effect, Martians. Some scientists think the fossils formed underwater, in shallow Martian seas, while others think they were caused by rain and came from our atmosphere here on Earth.
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