CAN PLAN­ETS OR­BIT A MOON?

Science Illustrated - - ASK US -

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.

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