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This finding raises the possibility of other planets with water-rich atmospheres in our galaxy. However, it remains uncertain whether the observed water vapor is in a hydrogen-rich atmosphere or if the planet's atmosphere is predominantly water.

Water on a planet this small is a landmark discovery, pushing us closer than ever to characterizing truly Earth-like worlds, and thanks to the Hubble Space Telescope we’ll be able to continue our search for more planets like our own.

For more information, visit https://nasa.gov/hubble.

Music Credit:
“Biorhythms” by Jia Lee [PRS] via Zone Music Ltd [PRS] and Universal Production Music

Image Credits:
Image of Europa:
Credit: NASA/ESA/W. Sparks (STScI)/USGS Astrogeology Science Center

Exoplanet Animation:
Credit: ESA/Hubble, M. Kornmesser

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