Daily Extra :
Ammonia : A colorless gas made of nitrogen and hydrogen. It has a sharp smell. It can be mixed with water and used for household cleaning.
Who Was Born Today?:
1960: Peggy A. Whitson, Mt Ayr Iowa, PhD/astronaut
Who Died Today?:
Today in History:
1986: Halley's Comet reaches 30th perihelion (closest approach to Sun)
1990: Galileo flies by Venus
1994: Clementine, a US Lunar Orbiter (launched January 25, 1994), spent 70 days (between February 6 and May 5, 1994) in 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. 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.
1995: Bernard Harris became the first African American astronaut to take a spacewalk.