Dec 31 2011 NASA Grail Probes To Begin Lunar Orbit
HOUSTON - U.S. space agency NASA says its twin lunar spacecraft that are on a mission to study the Moon’s gravitational field and internal structure are set to begin orbiting Earth’s satellite on Saturday and Sunday.
NASA launched the two unmanned Gravity Recovery and Interior Laboratory, or GRAIL, probes in September. It says the first probe, […]
