page_title: List of spacewalks and moonwalks 1965–1999
section_title: 1990 spacewalks
hierarchical_section_title: List of spacewalks and moonwalks 1965–1999 / 1990–1994 spacewalks / 1990 spacewalks
caption_attribution_description: English: Jerry Ross during the first EVA on STS-37 - STS-37 Mission Specialist (MS) Jerry L. Ross, suited in extravehicular mobility unit (EMU), peers into Atlantis', Orbiter Vehicle (OV) 104's, aft flight deck viewing window while performing emergency extravehicular activity (EVA) procedures in the payload bay (PLB). The unscheduled EVA was necessary to manually extend the Gamma Ray Observatory's (GRO's) high gain antenna (HGA). The GRO grappled by the remote manipulator system (RMS) end effector and held above the PLB is visible in the background. The entire scene is backdropped against the blue and white surface of the Earth.
context_page_description: This list contains all spacewalks and moonwalks performed from 1965 to 1999 where an astronaut has fully or partially left a spacecraft. Entries for moonwalks are shown with a gray background while entries for all other EVAs are uncolored.
  All spacewalks have had the astronauts tethered to their spacecraft except for seven spacewalks by the United States. All moonwalks were performed with astronauts untethered, and some of the astronauts traveled far enough to lose visual contact with their craft. One lunar EVA was not a moonwalk, but rather a stand-up EVA partially out the top hatch of the LM, where it was thought that the extra height would help with surveying the area prior to conducting the moonwalks. Only three deep-space EVAs have ever been conducted, where the activity was neither on the lunar surface nor in low Earth orbit, but far away from both the Moon and the Earth.
caption: Jerry Ross performs an unscheduled EVA to release the high-gain antenna on the Compton Gamma Ray Observatory, berthed inside the payload bay of Atlantis during STS-37.
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