NASA Universe(@NASAUniverse):#TBT to Sept. 20, 1979, when NASA’s final High Energy Astronomy Observatory, HEAO 3, launched into space. It mapped the sky in gamma-ray light and made detailed measurements of cosmic ray particles, helping us learn about supernova remnants, distant galaxies, and more.

NASA Universe

@NASAUniverse

Your backstage pass to the universe and how NASA studies it. Exoplanets, black holes, dark energy, and more!

Joined March 2009

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NASA Universe@NASAUniverse

2026.09.24 17:58

#TBT# to Sept. 20, 1979, when NASA’s final High Energy Astronomy Observatory, HEAO 3, launched into space. It mapped the sky in gamma-ray light and made detailed measurements of cosmic ray particles, helping us learn about supernova remnants, distant galaxies, and more.