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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 August 1, 2015

COBE Deciphering the static of the early universe November 17, 2014

Distant Neighbors Looking for distant neighbors May 20, 2014

Glowing Aliens Warming up to alien civilizations March 31, 2014

Earth Impacts IV Going to work for planetary defense January 8, 2014

GALEX Keeping an eye on the galactic action April 27, 2013

Explorer 11 A first glimpse of the universe April 26, 2011

Taking Inventory Taking inventory of the solar system March 25, 2011

Featured Images

COBE view of the cosmic microwave background

Afterglow November 18, 2014

WISE view of the Vela Nebula in Cygnus

Glowing Civilizations? April 1, 2014

Ultraviolet view of spiral galaxy NGC 6744 from the GALEX spacecraft

End of the Line June 29, 2013

First Snapshot January 7, 2010