Explorer Missions

NASA's longest-running series of spacecraft, with more than 75 successful missions. Explorer 1, launched January 31, 1958, was the first successful American satellite. Other Explorers have studied the solar wind, Earth's magnetic field, the "afterglow" of the Big Bang, the ultraviolet glow of distant galaxies, and many other subjects.

Radio Programs

Energy Hogs Looking for signs of a super-civilization Sunday, August 2, 2015
COBE Deciphering the static of the early universe Tuesday, November 18, 2014
Distant Neighbors Looking for distant neighbors Wednesday, May 21, 2014
Glowing Aliens Warming up to alien civilizations Tuesday, April 1, 2014
Earth Impacts IV Going to work for planetary defense Thursday, January 9, 2014
GALEX Keeping an eye on the galactic action Sunday, April 28, 2013
Explorer 11 A first glimpse of the universe Wednesday, April 27, 2011
Taking Inventory Taking inventory of the solar system Saturday, March 26, 2011
WISE II Keeping a WISE observatory cool Friday, October 29, 2010
WISE "Wising up" to new discoveries Thursday, October 28, 2010

Featured Images

COBE view of the cosmic microwave background
Afterglow Tuesday, November 18, 2014
WISE view of the Vela Nebula in Cygnus
Glowing Civilizations? Tuesday, April 1, 2014
Ultraviolet view of spiral galaxy NGC 6744 from the GALEX spacecraft
End of the Line Saturday, June 29, 2013
First Snapshot Thursday, January 7, 2010


©2015 The University of Texas McDonald Observatory