STS-93 carried the Chandra X-ray observatory, one of NASA's Great Observatories alongside Hubble, and which has been operating continually for the past 25 years

STS-93 carried the Chandra X-ray observatory, one of NASA's Great Observatories alongside Hubble, and which has been operating continually for the past 25 years. It can likely continue for up to another decade before it runs out of fuel, except that budgetary pressures mean that it might be cancelled this year: https://www.savechandra.org/ https://www.savechandra.org/