High Energy Astronomy Observatory (HEAO) satellites, 1977.
3 3 c m
40cm
actual image size: 32cm x 25cm

High Energy Astronomy Observatory (HEAO) satellites, 1977.

NASA

© National Aeronautics & Space Administration / Science & Society

Description

Three HEAO satellites were launched between August 1977 and September 1979. They mapped the sky at X-ray wavelengths, increasing the number of known X-ray sources from 500 to 1500.
 

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Image Ref.

10300607
 

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