SPICA is a Japanese-led proposed infrared space telescope, successor of the successful AKARI spacecraft. This mission seeks to take the next step in investigating the mid (> 5 micrometers) through far (400 micrometers) infrared portion of the spectrum to observe many astrophysical phenomena from distant galaxies to star and planet forming systems in our own Galaxy. NASA is considering a contribution to SPICA, including to develop and use scientific instrumentation capable of achieving the spectroscopic goals of SPICA.
Recommended by the 2010 "New Worlds, New Horizons in Astronomy and Astrophysics" report, a UV/Optical telescope as a successot to HST is being studied. The instrumentation being considered includes high-efficiency UV and optical cameras / spectrographs operating at shorter wavelengths than HST, with the possibility of internal coronagraphs or external star-shades. NASA's Cosmic Origins Program is investing in essential technologies such as detectors, coatings, and optics, to prepare for a mission to be considered by the 2020 decadal survey.
The Hubble Space Telescope is in a decaying orbit that will cause an uncontrolled re-entry in around 2025. To prevent the hazards created by such an event, the Cosmic Origins Program Office has undertaken a study of a mission to dispose of the great observatory, either by controlled re-entry or placement into a long life orbit.