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The New York Times

Jupiter’s Biggest Moons Started as Tiny Grains of Hail

18 May 2020, 16:36 UTC
Jupiter’s Biggest Moons Started as Tiny Grains of Hail
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From left, Europa, Callisto and Io, three of the four largest moons of Jupiter, and their shadows crossing the red giant in an image captured by the Hubble Space Telescope in 2015.

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