"Astronauts to Conduct Rare Repair Spacewalk on Leaky ISS Telescope"
NASA plans to send astronauts to repair the Neutron star Interior Composition Explorer (NICER) telescope on the International Space Station (ISS) due to a "light leak" issue affecting its X-ray measurements. The telescope, launched in 2017, was not designed for servicing, presenting a challenge for the repair. This will be the fourth science observatory that NASA has risked astronauts to repair, highlighting the risks and rewards of having astronauts fix equipment not originally intended for servicing in space.