NASAのインスタグラム(nasagoddard) - 12月13日 02時01分

Water Vapor Over Europa
This graphic shows the location of water vapor detected over the south pole of Jupiter's moon Europa in observations taken by NASA's Hubble Space Telescope in December 2012. This is the first strong evidence of water plumes erupting off Europa's surface.
Hubble didn't photograph plumes, but spectroscopically detected auroral emissions from oxygen and hydrogen. The aurora is powered by Jupiter's magnetic field. This is only the second moon in the solar system found ejecting water vapor from the frigid surface. The image of Europa is derived from a global surface map generated from combined observations taken by NASA's Voyager and Galileo space probes.

Image credit: NASA/ESA/L. Roth/SWRI/University of Cologne

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