The planet Mercury does not have a moon. At one time, astronomers from NASA thought the planet Mercury might have a moon, but research proved that theory to be incorrect.Continue Reading
When astronomers thought Mercury had a moon in the mid-1970s, it was because of data about an unusual amount of radiation that had been received from the Mariner 10 mission. This radiation turned out to be created by a star, not a moon.
One theory is that Mercury might have, at one time, had a moon that broke apart, leaving debris to crash to the planet. This theory could be reasonably supported by the large amount of impact craters covering the surface of the planet.Learn more about Planets