NASA's Galileo probe performs a flyby of the asteroid 243 Ida. Astronomers later discover a moon, the first known asteroid moon, in pictures from the flyby and name it Dactyl.

The National Aeronautics and Space Administration is an independent agency of the U.S. federal government responsible for the United States' civil space program, as well as research in aeronautics and space. Headquartered in Washington, D.C., NASA operates ten field centers across the US and is…