List of proposed space telescopes

It is a list of past and present space observatory plans, concepts, and proposals.

For observatories in orbit, see list of space telescopes.

Unlike that list, this one includes concepts and proposals that are unlikely ever to be launched, as they may have been cancelled or were only proposals.

[14] [20] [20] [20] ultraviolet Geostationary orbit For launch in the 2030s, NASA is evaluating four possible designs: the Origins Space Telescope, Lynx X-ray Observatory, Habitable Exoplanets Observatory (HabEx), and Large UV Optical Infrared Surveyor (LUVOIR).

A 20–30 meter balloon telescope has been suggested.