Color picture shows asteroid Ida and its moon, Dactyl.

Photojournal: PIA00069

This enhanced color picture shows asteroid Ida and its moon, Dactyl. NASA's Galileo spacecraft made a close approach to Ida while en route to Jupiter and provided this first observation of an asteroid with a satellite—its own moon. Astronomers have since discovered other asteroids with companions.

Credit

NASA/JPL

ENLARGE

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