#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.
ALT This photograph was taken during encapsulation of HEAO 3 into the payload faring that would sit atop its rocket. The spacecraft, near the center of the image, is a tall, boxy structure mostly wrapped in white and shiny gold coverings. The module at its base is covered in shiny silver. Blue, segmented solar panels cover the left side of the spacecraft. On either side of HEAO 3 are the halves of a large white protective shroud that is cylindrical with a cone-shaped tip. Its interior is black. The clean room is stark white and brightly lit, filled with various equipment and structures. Several people stand near the base of the spacecraft, wearing protective white garments and hair coverings. The photo is watermarked “Credit: NASA.”