Vintage illustration of NASA's High Energy Astrophysical Observatory (HEAO) spacecraft – HEAO-1, HEAO-2 (Einstein Observatory), and HEAO-3 – orbiting Earth. These satellites, depicted above the planet, played a pivotal role in X-ray astronomy, discovering thousands of celestial sources. Each satellite is labeled A, B, and C respectively.

Astronomy Picture from 25/11/2000

A High Energy Fleet

Source: https://apod.nasa.gov/apod/ap001125.html


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