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Marcia Dunn

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(NASA/JPL-Caltech)

7 Earth-size worlds found orbiting star; could hold life

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Spotlight shining on Pluto on cold outskirts of solar system

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SpaceX Dragon set to blast off to space station

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(U.S. Navy photo by Mass Communication Specialist 3rd Class Jarod Hodge)

Weird news of the day

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Dragon arrives at space station in historic 1st

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Space Shuttle Atlantis lands at the Kennedy Space Center at Cape Canaveral, Fla. Thursday, July 21, 2011. The landing of Atlantis marks the end of NASA's 30 year space shuttle program. (AP Photo/Don Emmert, Pool) (AP)

Last space shuttle comes home, ends 30-year era

Marcia Dunn

A photo released by Nasa shows the Endeavour with a backdrop of a night time view of the Earth and the starry sky, while docked at the International Space Station on Saturday May 28, 2011. The STS-134 astronauts left the station the next day on May 29, after delivering the Alpha Magnetic Spectrometer and performing four spacewalks during Endeavour's final mission. (AP Photo/NASA) (AP)

Next-to-last space shuttle flight lands on Earth

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(AP)

NASA clears space shuttle for Monday launch

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In this picture made available by NASA, the last crew of the space shuttle Endeavour stands together on Launch Pad 39A in front of its external fuel tank and solid rocket boosters at the Kennedy Space Center in Cape Canaveral, Fla. on Thursday, April 28, 2011, one day before its final flight. From left are Mission Specialists Michael Fincke, Andrew Feustel, Pilot Greg H. Johnson, Commander Mark Kelly, European Space Agency astronaut Roberto Vittori and Mission Specialist Greg Chamitoff. (AP Photo/NASA, Kim Shiflett) (AP)

Astronauts back for next-to-last shuttle flight

Marcia Dunn

In this picture made available by NASA, the last crew of the space shuttle Endeavour stands together on Launch Pad 39A in front of its external fuel tank and solid rocket boosters at the Kennedy Space Center in Cape Canaveral, Fla. on Thursday, April 28, 2011, one day before its final flight. From left are Mission Specialists Michael Fincke, Andrew Feustel, Pilot Greg H. Johnson, Commander Mark Kelly, European Space Agency astronaut Roberto Vittori and Mission Specialist Greg Chamitoff. (AP Photo/NASA, Kim Shiflett) (AP)

NASA: Endeavour’s last launch delayed again

Marcia Dunn

FILE - In this undated file photo provided by the office of Rep. Gabrielle Giffords, Giffords, left, is shown with her husband, NASA astronaut Mark Kelly. There are hints that astronaut Mark Kelly will take a shuttle into space in April. That would mean leaving his wounded wife, Rep. Gabrielle Giffords, to continue her rehab work without him for at least a few weeks. Scott Kelly, also an astronaut, said his brother would decide fairly soon whether to fly the space shuttle mission in April. (AP Photo/Office of Rep. Gabrielle Giffords, File) (AP)

NASA: Giffords’ astronaut husband going to fly

Marcia Dunn

FILE - In this undated file photo provided by the office of Rep. Gabrielle Giffords, Giffords, left, is shown with her husband, NASA astronaut Mark Kelly. There are hints that astronaut Mark Kelly will take a shuttle into space in April. That would mean leaving his wounded wife, Rep. Gabrielle Giffords, to continue her rehab work without him for at least a few weeks. Scott Kelly, also an astronaut, said his brother would decide fairly soon whether to fly the space shuttle mission in April. (AP Photo/Office of Rep. Gabrielle Giffords, File) (AP)

Giffords’ husband faces troubling predicament

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Henry Cruz, lower right, looks at a space shuttle Challenger replica honoring USAF Colonel Ellison Onizuka, the first Japanese American astronaut who died in the Challenger explosion in 1986, at a memorial Wednesday Jan. 26, 2011 in Los Angeles. Friday marks the 25th anniversary of the explosion of the space shuttle Challenger which killed seven astronauts. (AP Photo/Nick Ut) (AP)

NASA marks 25th anniversary of Challenger accident

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Shuttle launch off until end of month to fix leak

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Millionaire’s test rocket reaches orbit on 1st try

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Astronauts give space station extra compartment

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