(Description) Figure 32 Asteroid 243 Ida and its moon Dactyl, imaged in 1993 by the Galileo spacecraft. Ida is 54 km in length, but Dactyl is much smaller at less than 2 km across

Week 1: What are moons?

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This is an image of Asteroid 243 Ida and its moon Dactyl, imaged in 1993.