Shuttle Atlantis leaves space station, headed home

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This image from NASA TV shows the International Space Station drifting away from the Space Shuttle Atlantis shortly after undocking early Wednesday Nov. 25, 2009. The shuttle is scheduled to land at the Kennedy Space Center, Friday morning. (AP Photo/NASA)

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Shuttle Atlantis... This image from NASA TV shows the International Space Station drifting away from the Space Shuttle Atlantis shortly after undocking early Wednesday Nov. 25, 2009. The shuttle is scheduled to land at the Kennedy Space Center, Friday morning. (AP Photo/NASA)
Icebergs head fr... In this Nov. 16, 2009 photo released by the Australian Antarctic Division, an iceberg is seen at Sandy Bay on Macquarie Island's east coast, in the Southern Ocean 1,500 kilometers (930 miles) southeast of Tasmania, Australia. It is very rare to see icebergs from Macquarie Island and is uncommon to find icebergs in this general region. (AP Photo/Australian Antarctic Division, Eve Merfield)
Big Bang atom sm... Scientists gather at the European Organisation for Nuclear Research (CERN) data quality satellite control center of the ATLAS detectors during the restart of the Large Hadron Collider (LHC) in Meyrin, near Geneva, Switzerland, Monday, Nov. 23, 2009. Scientists turned on the Large Hadron Collider on Friday night, Nov. 20, 2009, for the first time since the machine suffered a failure more than a year ago and had to be shut down shortly after the start. (AP Photo/Keystone, Laurent Gillieron)
Comatose for 23 ... Belgium's Rom Houben uses his touchscreen and assistance of his speech therapist Linda Wouters, left, to communicate during an interview at the service center ' t Weyerke in Zolder, Belgium, Tuesday, Nov. 24, 2009. Houben was misdiagnosed for 23 years as being in a coma until a doctor at Liege University discovered three years ago that Houben's brain was still functioning. Houben was diagnosed as being in a vegetative state following a car crash in 1983. The discovery took place three years ago but only recently came to light, after publication of a study on the misdiagnosis of people with consciousness disorders.(AP Photo/Yves Logghe)
Rare Charles Dar... FILE - In this undated file photo, British scientist Charles Robert Darwin, founder of the theory for the evolution of life is seen at an unknown location. An auction house said Sunday, Nov. 22, 2009 it is selling a rare first edition of Charles Darwin's "On the Origin of Species" found in a family's guest lavatory in southern England. (AP Photo, File)
Ukraine's `hot a... This Oct. 14, 2009 photo shows water pouring from rusted cooling pipes in Konstantinovka, Ukraine. In an era of climate change and carbon trading, Ukraine, ironically, is profiting from the smokeless smokestacks of its industrial shutdown. (AP Photo/John McConnico)
Atlantis leaves ... Astronaut Robert L. Satcher Jr., STS-129 mission specialist, waves at his space-walking crewmates from inside the crew cabin of the space shuttle Atlantis
Darwin debate ra... Pigeon bones are displayed in Charles Darwin's former home Down House, Kent, southern England
Big Bang machine... Scientists look at a computer screen at the control centre of the CERN in Geneva
Dark ocean depth... A rare "Dumbo" octopod is seen in the depths of the ocean in this undated handout photo