Mars Once Had Oxygen-Rich Atmosphere

New research by scientists at Oxford University in England has revealed that Mars may have also had an oxygen-rich atmosphere about four billion years ago, nearly 1.5 billion years before Earth developed its atmospheric oxygen.

The scientists, led by Professor Bernard Wood, first studied the chemical composition of Martian meteorites that fell to Earth, which they say probably came from the deep interior of Mars. They made a similar examination of rocks that were found on the surface of …

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