Sentence examples for maintenance missions from inspiring English sources
Four and a half months after he seemed to doom the Hubble Space Telescope by ending maintenance missions by the space shuttle, NASA's administrator, Sean O'Keefe, brought brighter news to astronomers on Tuesday by announcing that NASA was seeking proposals for a robotic mission to extend Hubble's life.
That is how Dr. John M. Grunsfeld, astronomer, astronaut and chief scientist of NASA, described the Hubble Space Telescope when he announced last month that the agency was canceling maintenance missions to the telescope, which has dazzled the world with crisp visions of the cosmos.
Such maintenance missions won't be possible with the Webb.
Since it was launched, astronauts have visited the Hubble Telescope on repair and maintenance missions four times, the last in 2002.
These plans emphasized the need for manned maintenance missions to the telescope to ensure such a costly program had a lengthy working life, and the concurrent development of plans for the reusable space shuttle indicated that the technology to allow this was soon to become available.
The last maintenance mission was in March 2002.
Those requirements bear on any decision to proceed with shuttle operations -- especially on requirements for a maintenance mission to the Hubble.
Earlier this month, the firm was given a $330m contract by NASA to design a robotic maintenance mission for the Hubble space telescope.
A half-dozen Verizon workers are assumed to have perished in the trade center's destruction, among them two technicians who were in the North Tower on a maintenance mission.
At NASA's Goddard Space Flight Center in Greenbelt, Md., engineers are testing a spare router in the hopes that astronauts can replace the damaged unit as part of the next and last maintenance mission, which has been postponed until at least February.
Meanwhile, at Goddard, engineers are testing a spare router in the hopes that astronauts can take it to Hubble and replace the damaged unit as part of the next and last maintenance mission, which has been postponed until at least February.
