Skywatchers on Thursday evening, Feb. 6, will notice an eye-catching pairing-off between two of the brightest objects in the nighttime sky. The moon, nearly two nights past first quarter and appearing ...

Jupiter has 95 known moons and many moonlets, which are believed to have been created as the CPD coalesced and broke apart. But how that process came about and evolved is still mostly a mystery.

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is named for a mythological woman transformed into a cow during a marital dispute. Because Io is so close to its massive host planet, the moon is subjected to a tremendous gravitational pull as it ...

The hellish surface of a moon of Jupiter known as Io is riddled with ... discovered by the ancient astronomer Galileo in 1610, is named for a mythological woman transformed into a cow during ...