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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

new space telescope looking at a nebula

Magnet Hunter October 19, 2021

two views of uhuru

Pioneering Explorer December 12, 2020

Infrared view of Lambda Centauri Nebula

A WISE spacecraft December 14, 2019

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