Hubble Space Telescope's 1980s computer glitch may run deeper than NASA thought

The Hubble Space Telescope was originally deployed on April 25, 1990, from the space shuttle Discovery.
The Hubble Space Telescope was originally deployed on April 25, 1990, from the space shuttle Discovery. (Image credit: NASA/Smithsonian Institution/Lockheed Corporation)

It turns out it's tricky to troubleshoot a 1980s computer that's dashing around Earth hundreds of miles over our heads.

NASA has spent more than a week evaluating a computer issue that put the venerable Hubble Space Telescope out of commission on June 13 and that may force the spacecraft to turn to its backup computer. Now, ongoing tests suggest that the issue the team has identified so far may not be at the root of the computer's problems, according to an update from the agency.

"After performing tests on several of the computer’s memory modules, the results indicate that a different piece of computer hardware may have caused the problem, with the memory errors being only a symptom," NASA officials wrote in a statement published Tuesday (June 22).

Related: The best Hubble Space Telescope images of all time!

Although the initial anomaly suggested that a memory module was degrading, the team now suspects that the root of the issue might be in the computer's central processing module or that unit's connection with interface hardware.

Right now, the statement added, the team is designing tests to more confidently identify the problem; those tests "will be run in the next few days."

The NASA statement suggests that the team hasn't yet given up hope of reviving the main payload computer, but does lay out the plan for if that feat can't be accomplished. The telescope carries a backup computer that, like the main unit, was installed in 2009 during the final astronaut servicing mission but hasn't been used since.

"The backup computer has not been powered on since its installation in 2009; however, it was thoroughly tested on the ground prior to installation on the spacecraft," NASA officials wrote in the statement.

If the team is forced to turn to the backup unit, Hubble would switch to that unit's central processing module and interface hardware. Switching computers would not affect access to the four memory modules on the spacecraft, NASA noted.

Astronauts deployed the Hubble Space Telescope from the space shuttle Discovery on April 25, 1990; five crews of astronauts later visited the spacecraft in orbit to repair and upgrade the technology and instruments on board. However, NASA can no longer send such missions to fix the telescope, since they relied on the agency's fleet of space shuttles, which retired in 2011.

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Meghan Bartels
Senior Writer

Meghan is a senior writer at and has more than five years' experience as a science journalist based in New York City. She joined in July 2018, with previous writing published in outlets including Newsweek and Audubon. Meghan earned an MA in science journalism from New York University and a BA in classics from Georgetown University, and in her free time she enjoys reading and visiting museums. Follow her on Twitter at @meghanbartels.