Category
page 1Cancelled space telescopes
Terrestrial Planet Finder
proposed project by NASA to construct a system of space telescopes for detecting extrasolar terrestrial planets; postponed several times and finally cancelled in 2011
Darwin
suggested ESA Cornerstone mission
SIM Lite Astrometric Observatory
cancelled NASA space telescope
XEUS
XEUS (X-ray Evolving Universe Spectroscopy) was a space observatory plan developed by the European Space Agency (ESA) as a successor to the successful XMM-Newton X-ray satellite telescope. It was merged to the International X-ray Observatory (IXO) around 2008, but as that project ran into issues in 2011, the ESA component was forked off into Advanced Telescope for High Energy Astrophysics (Athena).
Eddington
cancelled ESA mission to search for extrasolar planets
International X-ray Observatory
cancelled American-ESA-Japanese space telescope project
Astro-G
ASTRO-G (also known as VSOP-2, and very rarely called VSOP-B) was a planned radio telescope satellite by JAXA. It was expected to be launched into elliptic orbit around Earth (apogee height 25,000 km, perigee height 1,000 km).
Constellation-X Observatory
NASA mission concept