LYNETTE COOK / SCIENCE PHOTO LIBRARY LYNETTE COOK / SCIENCE PHOTO LIBRARY
Not for use in popular astronomy and related books for adults.
Early Jupiter and Europa. Artwork of early Jupiter (right) as seen from its moon Europa four billion years ago. The Sun can be seen in the sky, left of centre. The young Jupiter was a hot protoplanet releasing enough energy through gravitational contraction to warm Europa and maintain a liquid ocean. Today, Europa is covered with a thick layer of frozen ice.
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