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STS-125 Mission Specialist Megan McArthur fits the helmet on her launch-and-entry suit before heading for Launch Pad 39A at NASA's Kennedy Space Center in Florida. This launch will be McArthur's first space shuttle flight. Liftoff is scheduled for 2:01 p.m. May 11 EDT. Atlantis' 11-day flight will include five spacewalks to refurbish and upgrade NASA's Hubble Space Telescope with state-of-the-art science instruments that will expand Hubble's capabilities and extend its operational lifespan through at least 2014. The payload includes a Wide Field Camera 3, fine guidance sensor and the Cosmic Origins Spectrograph.