Daily Extra :
Astronomy & Space Word of The Day
spectrometer: An instrument that measures the wavelength of electromagnetic radiation.
Today in History:
1845: Astraea discovered by K.L. Hencke, fifth asteroid discovered.
1972: Apollo 17 - USA Manned Lunar Lander (December 7-19, 1972) Crew: Eugene A. Cernan, Harrison H. Schmitt, and Ronald B. Evans. Cernan and Schmitt landed on the moon on December 12, 1972. The landing site was Taurus-Littrow at latitude 20°10' N and longitude 30°46' E. They returned 110.5 kg of rock and soil samples. The astronauts covered 30.5 kilometers in the lunar rover during a 75-hour stay.
1990 & 1992: Galileo - USA & Europe Jupiter Orbiter/Atmospheric Probe - 2,222 kg - (October 18, 1989) Galileo was designed to study Jupiter's atmosphere, satellites and surrounding magnetosphere for 2 years. In order to get there, it used gravity assist techniques to pick up speed by flying past Venus on February 10, 1990. It then flew past the Earth & Moon on December 8, 1990 and then again on December 8, 1992. It has made encounters with asteroid 951 Gaspra on October 29, 1991, and asteroid 243 Ida on August 28, 1993.