After three spacewalks, the Alpha Magnetic Spectrometer is almost ready to resume collecting cosmic rays.
NASA’s 42-year-old planetary probe joins its twin beyond the heliopause
NASA’s intrepid, 42-year-old planetary probe joins its twin beyond the heliopause.
In mid-May 1969, only one hurdle remained before NASA would attempt to land astronauts on the Moon: a flight test.
Explorer 1 gathered the first scientific information from orbit
In January 1958, after initial failures with Vanguard and U.S.S.R. success with Sputnik, the U.S. made it into orbit.