Market
Which on-orbit NASA observatory will next undergo a major repair mission by the end of 2025?
3
NASA•Sunita Williams•Nick Hague•US Spacewalk 91•International Space Station•ISS•NICER•Alpha Magnetic Spectrometer•Williams•Hubble Space Telescope
Resolution / Starting Odds
Hubble Space Telescope • 25%
James Webb Space Telescope • 25%
NICER Telescope • 25%
Other • 25%
NASA mission announcements and press releases
Story
Sunita Williams Makes First Spacewalk in 12 Years to Repair NICER Telescope in US Spacewalk 91
Jan 16, 2025, 01:46 PM
NASA astronauts Sunita Williams and Nick Hague are conducting US Spacewalk 91 outside the International Space Station (ISS) to repair the NICER (Neutron star Interior Composition Explorer) X-ray telescope and upgrade the Alpha Magnetic Spectrometer. The spacewalk began at 8 am ET and is expected to last over six hours. This marks Williams' first spacewalk in 12 years and her eighth overall. After being in orbit for over seven months—what was originally planned as a week-long test flight—the astronauts are stepping outside to perform critical repairs and maintenance tasks. The NICER telescope, which has 56 X-ray connectors, is the first NASA observatory to be repaired on-orbit since the last servicing mission to the Hubble Space Telescope in 2009. Their work involves patching thermal shields to prevent light leaks and aims to unlock the secrets of black holes, neutron stars, and dark matter.
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