Differences between Martian meteorites and rocks examined by a NASA rover can be explained if Mars had an oxygen-rich atmosphere 4,000 million years ago — well before the rise of atmospheric oxygen on Earth 2,500 million years ago.
Differences between Martian meteorites and rocks examined by a NASA rover can be explained if Mars had an oxygen-rich atmosphere 4,000 million years ago — well before the rise of atmospheric oxygen on Earth 2,500 million years ago.