| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
| Io, in astronomy |
( ´ ) (KEY) , in astronomy, one of the 39 known moons, or natural satellites, of Jupiter. Io is subject to Jupiter’s enormous tidal forces and is, as a result, the most volcanically active body in the solar system. |
| The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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