NASA Hunts for Remains of an Ancient Planet near Earth

Astronomy
NASA Hunts for Remains of an Ancient Planet near Earth
By NASA
Apr 9, 2009, 15:19 PST

Summary: "NASA's twin STEREO probes are entering a mysterious region of space to look for remains of an ancient planet which once orbited the Sun not far from Earth. If they find anything, it could solve a major puzzle--the origin of the Moon."

Source URL: http://science.nasa.gov/headlines/y2009/09apr_theia.htm?list68782