LONDON: Mars had an oxygenrich atmosphere 4,000 million years ago a new Oxford study has found. 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 รข€" well before the rise of atmospheric oxygen on Earth 2,500 million years ago.
Scientists investigated the compositions of Martian meteorites found on Earth and data from NASA's "Spirit" rover that examined surface rocks in the Gusev crater on Mars. The fact that the surface rocks are five times richer in nickel than meteorites was puzzling. "What we have shown is that both meteorites and surface volcanic rocks are consistent with similar origins but that the surface rocks come from a more oxygen rich environment," said Prof Bernard Wood of department of earth sciences.
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