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Europa (yŏrōˈpə) [key], in astronomy, one of the 39 known moons, or natural satellites, of Jupiter. Magnetic-field data collected by the space probe Galileo in 2002 strongly indicates a liquid-water ocean—similar to oceans found on Earth and possibly capable of supporting simple life forms—beneath Europa's frozen surface.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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