Space shuttle Atlantis (foreground) sits on Launch Pad A and Endeavour
on Launch Pad B at NASA's Kennedy Space Center in Florida. At the left
of each shuttle are the open rotating service structures with the
payload changeout rooms revealed. The rotating service structures
provide protection for weather and access to the shuttle.
the first time since July 2001, two shuttles are on the launch pads at
the same time. Endeavour will stand by at pad B in the unlikely event
that a rescue mission is necessary during Atlantis' upcoming STS-125
mission to repair NASA's Hubble Space Telescope. The missions is slated
to launch Oct. 10.
After Endeavour is cleared from its duty
as a rescue spacecraft, it will be moved to Launch Pad 39A for its
STS-126 mission to the International Space Station. That flight is
targeted for launch Nov. 12.
Link: NASA - Mirror Images
Image below. It is beautiful!!