A Martian meteorite has signs of huge impacts that suggest Mars was bombarded with asteroid strikes for 30 million years longer than previously thought
of meteorites suggests these impacts stopped on Mars 4.48 million years ago, allowing the planet to develop conditions that may have been advantageous for life by about 4.2 billion years ago.
“To give you a sense of scale, you could set several of the grains side by side across the width of a human hair,” says Cavosie. “They are about 40 or 50 micrometres across.”
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