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Galilean Moons Galilean Moons • On Jan. 7, 1610, Galileo Galilei's improvements to the telescope enabled humanity to see Jupiter's four largest On Jan. 7, 1610, Galileo Galilei's improvements to the telescope enabled humanity to see Jupiter's four largest moons for the first time.first time. On Jan. 7, 1610, Galileo Galileo improvements to the telescope enabled humanity to see Jupiter's four largest moons for the first time.
Europa Europa • Europa's smooth, icy surface likely conceals an ocean of liquid water. New Horizons obtained data on Europa's surface composition and imaged subtle surface features, and analysis of these data may provide new information about the ocean and the icy shell that covers it. • Europa's smooth, icy surface likely conceals an ocean of liquid water. New Horizons obtained data on Europa's surface composition and imaged subtle surface features, and analysis of these data may provide new information about the ocean and the icy shell that covers it.
http://www.nasa.gov/multimedia/imagegallery/image_feature_1560.htmlhttp://www.nasa.gov/multimedia/imagegallery/image_feature_1560.html