Launch on Need Shuttle in position for STS-125
The Space Shuttle is going up today, but because it is heading to the Hubble Space Telescope and not toward the International Space Station, some special ‘rescue’ preparations are being made at the Cape. The Endeavour has been readied and rolled out to launch pad 39b just in case the Atlantis, launching from 39a runs into difficulty. Because the ISS and Hubble are on vastly different orbits, should a problem arise with Atlantis there is no docking at the Space Station. Once this mission is completed, and no rescue needed, Endeavour will move to 39a for its mission in November and 39b will begin a rebuilding for the Constellation missions.
Neat pic of both shuttles.

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