Science Illustrated

CAN PLANETS ORBIT A MOON?

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By definition, a planet orbits a star, and a moon orbits a planet. There is no name for a world that orbits a moon, but asteroids, which usually orbit the Sun, could theoretica­lly orbit a moon. For years, NASA planned to build a robotic craft that was to capture a fragment of an asteroid and push it into an orbit around the Moon, where scientists could take a closer look at it.

 ??  ?? For a long time, NASA planned to force a fragment of an asteroid into an orbit around the Moon.
For a long time, NASA planned to force a fragment of an asteroid into an orbit around the Moon.

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