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NASA: The Moon Once Had an Atmosphere That Faded Away

From TIME - October 9, 2017

The moon likely had an ancient, temporary atmospheresimilar to the pocket of gases that surround Eartharound 3 to 4 billion years ago, according to a new study.

Scientists at NASA's Marshall Space Flight Center and the Lunar and Planetary Institute (LPI) in Houston found that the atmosphere was caused by ancient volcanos spewing gases into the lunar sky faster than they could escape to space.

The atmosphere, which was about 2% the density of Earth's but twice that of Mars, lasted for around 70 million years before sputtering away into space.

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