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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.

Featured Images

two views of uhuru

Pioneering Explorer December 12, 2020

Infrared view of Lambda Centauri Nebula

A WISE spacecraft December 14, 2019

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

Radio Programs

EUVE Looking through a galactic “Swiss cheese” June 7, 2017

Looking Deep Looking into the hearts of planets March 21, 2017

Time Machine Traveling to the early solar system March 20, 2017

NICER A “nicer” kind of satellite February 21, 2017