Astronomers using NASA’s Hubble Space Telescope have observed water vapor in the atmosphere of the smallest exoplanet ever detected. Located 97 light-years away, planet GJ 9827d is approximately twice the size of Earth.

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.

Credit: NASA's Goddard Space Flight Center
Paul Morris: Lead Producer
Cassandra Morris: Voiceover

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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