Telescope for Habitable Exoplanets and Interstellar/Intergalactic Astronomy (THEIA) is a NASA-proposed 4-metre optical/ultraviolet space telescope that would succeed the Hubble Space Telescope and complement the infrared-James Webb Space Telescope. THEIA would use a 40-metre occulter to block starlight so as to directly image exoplanets.
It was proposed with three main instruments and an occulter: eXoPlanet Characterizer (XPC) Star Formation Camera (SFC), Ultraviolet Spectrograph (UVS) A separate occulter spacecraft
See also List of proposed space observatories
References
THEIA Website
External links 2010 white paper (.pdf) Design of a telescope-occulter system for THEIA