A giant cluster of about 3,000 stars called Westerlund 2. The cluster resides in a raucous stellar breeding ground known as Gum 29, located 20,000 light-years away in the constellation Carina. NASA, ESA, STScI/AURA hide caption

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A stump remains in the median of Manchester Boulevard as workers remove trees to clear a path for the space shuttle Endeavour in Inglewood, Calif., Tuesday. Residents are upset that 400 trees might be cut down to allow the shuttle to travel from the airport to its new home at a science center. Reed Saxon/AP hide caption

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SpaceX rocket Falcon 9 at Cape Canaveral in Florida was scheduled to launch Saturday morning, but aborted just before liftoff. Roberto Gonzalez/Getty Images hide caption

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More than a million people were expected in the area around the Kennedy Space Center to watch the launch. Many arrived before sunrise to claim the best seats. Scott Cameron/NPR hide caption

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Food packets containing the astronauts' "all-American meal," including (clockwise from top left) corn, chicken, brisket, and beans, along with a lemonade, at right. Devin Boldt/NASA - JSC hide caption

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The space shuttle Atlantis lifts off from the Kennedy Space Center Friday, July 8, 2011, in Cape Canaveral, Fla. Morry Gash/AP hide caption

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The Two-Way

Atlantis Lifts Off For Last Shuttle Mission

The shuttle blasted off almost on time, after concerns about the weather were overcome. Its mission to the International Space Station is scheduled to last 12 days.

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