Hubble spots persistent water vapor on Europa — but only in one hemisphere


One of the most promising locations to search for life in our solar system isn’t on a planet — it’s on a moon, specifically Jupiter’s moon Europa. Now, new evidence from the Hubble Space Telescope shows that there seems to be persistent water vapor spread across one of Europa’s hemispheres, where it is being sublimated from ice on the surface. But why this vapor is only present on one side of the moon remains unclear.

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