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HubbleSite Hubble Finds Oxygen Atmosphere on Jupiter's Moon, Europa

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Space Telescope Science

Astronomers using the Hubble telescope have identified the presence of an extremely tenuous atmosphere of molecular oxygen around Jupiter's moon, Europa. This makes Europa the first satellite ever found to have an oxygen atmosphere and only the third such solar system object beyond Earth to possess this gaseous element.

If all the oxygen on Europa were compressed to the surface pressure of Earth's atmosphere, it would fill only about a dozen Astrodome-sized stadiums.

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