Great Observatories program
- The Hubble Space Telescope (HST) looks at visible light and near-ultraviolet. It was launched in 1990. In 1997 ability to look at the near-infrared range was added. In 2009 there was a mission to service Hubble.
- The Compton Gamma Ray Observatory (CGRO) looks at gamma rays. It also looks at some hard x-rays as well. It was launched in 1991. It was deorbited in 2000.