HUBBLE MISSION A "GO"... Earlier this morning, NASA chief Michael Griffin officially gave the go-ahead to prepare for one last space shuttle flight to repair the Hubble Space Telescope (HST). The orbiter that will rendezvous with it will be Discovery, which launched HST into space in April of 1990. Lift-off for this next flight is set no earlier than May of 2008. Two new scientific instruments will be installed onto the orbiting observatory, and its batteries as well as devices used to point the spacecraft (such as its gyroscopes) will be replaced. Also, HST will be fitted with a docking mechanism that will allow a small rocket module to be attached to the telescope in the future...to guide it to a controlled re-entry of Earth's atmosphere once HST finally stops operating about 5 years after the next servicing flight. This will be the sixth shuttle mission—and fifth servicing flight overall—devoted to the space telescope. Astronauts revisited HST in 1993, ’97, ’99 and 2002, respectively, to upgrade it. The next modifications to Hubble should allow it to last at least till 2013, when its successor, the James Webb Space Telescope, is scheduled to launch.
The upcoming mission was originally scheduled for 2005...but cancelled in 2004 by then-NASA head honcho Sean O’Keefe following the 2003 Columbia disaster. The reason for this was because astronauts visiting the telescope had no place to seek refuge should a Columbia-type hole be found punctured in Discovery’s heat shield. All shuttles so far have been headed to the International Space Station, where astronauts could seek a safe haven should severe damage be found on their vehicle before the trip home. A rescue mission will be made available for the upcoming Hubble flight...with another shuttle being launched within a one week’s notice should Discovery be deemed unfit to return to Earth. Enough supplies will be placed onboard the spacecraft to allow astronauts to stay in orbit for about 25 days.
In other Discovery-related news, the orbiter is scheduled to be rolled into the cavernous Vehicle Assembly Building at Florida's Kennedy Space Center no earlier than 7 PM (Pacific Daylight Time) tonight...where it will be mated with its external fuel tank and twin solid rocket boosters for its upcoming flight. Discovery is still scheduled to launch December 7 on the next space station assembly mission, designated STS-116. The 2008 Hubble flight is designated STS-125.
UPDATE (November 1): According to NASASpaceflight.com, Atlantis might be used for the Hubble mission...making this the first time the orbiter flew to the telescope, as well as the very last mission for the vehicle before it is retired in 2008.
One more thing... Happy Halloween, everyone!
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