Daily Extra :
Astronomy & Space Word of The Day
saturation: Condition in which a surface becomes completely covered with craters, such that the addition of new craters does not increase the overall crater density.
Today in History:
1994: Clementine, USA Lunar Orbiter (launched January 25, 1994)left Lunar orbit. The official name for Clementine is 'Deep Space Probe Science Experiment' (DSPSE). It was a Department of Defense program used to test new space technology. Clementine was a new design using lightweight structure and propellant systems. It spent 70 days (between February 6 and May 5, 1994) in lunar orbit. Its four cameras mapped the surface of the Moon at 125-250 meters/pixel resolution. Clementine also used a laser to gather altimeter data which will make it possible to generate the first lunar topographic map.