The Hubble Space Telescope hovering above Earth. (Image credit: NASA)

NASA is reviving discussions to rescue the Hubble Space Telescope, which is operating well but is on track to reenter Earth's atmosphere about six years from now.

The agency issued a request for information (RFI) on Oct. 29 for "in-space servicing" capabilities, which could include boosting Hubble's orbit (which is naturally degrading due to atmospheric drag), or even a mission to "enhance its capabilities" in some way.

Hubble, which launched in April 1990 in partnership with the European Space Agency , was serviced five times by astronauts on space shuttle missions, the most recent being in 2009.…