NASA Universe(@NASAUniverse):#TBT to August 12, 1977, when our HEAO (High Energy Astronomy Observatory) 1 satellite launched into space. Its four instruments helped it map the X-ray and gamma-ray sky and identify interesting new sources for further study, including black holes, neutron stars, 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

2026.08.13 17:05

#TBT# to August 12, 1977, when our HEAO (High Energy Astronomy Observatory) 1 satellite launched into space. Its four instruments helped it map the X-ray and gamma-ray sky and identify interesting new sources for further study, including black holes, neutron stars, and more.