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A camera in the gondola of his balloon photographs Air Force Captain Joseph M. Kittinger Jr., as he starts the jump that set his record-breaking parachute jump over southern New Mexico on Aug. 8, 1960. Bettman/Corbis hide caption

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Bettman/Corbis

What It's Like To Freefall From 20 Miles Above The Earth

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Bob Ebeling, now 89, at his home in Brigham City, Utah. Howard Berkes/NPR hide caption

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Howard Berkes/NPR

Your Letters Helped Challenger Shuttle Engineer Shed 30 Years Of Guilt

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NASA Administrator Charles Bolden speaks at a panel discussion on the search for life beyond Earth at NASA headquarters in 2014. Joel Kowsky/NASA hide caption

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Joel Kowsky/NASA

First Black NASA Administrator Charles Bolden 'Pleaded' To Get Into Naval Academy

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A NASA team has attached nearly all of the hexagonal segments that will together make the primary mirror for the James Webb Space Telescope (pictured are practice segments). Chris Gunn/NASA hide caption

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Chris Gunn/NASA

Massive Space Telescope Is Finally Coming Together

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2015 was the warmest year on record — and by the widest margin ever, according to a new analysis by NASA and NOAA. Scientific Visualization Studio/Goddard Space Flight Center hide caption

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Scientific Visualization Studio/Goddard Space Flight Center

The inset image shows X-ray arcs that astronomers say are signs of galactic burping in the Messier 51 galaxy system, captured by NASA's Chandra X-ray Observatory. X ray: NASA/CXC/Univ of Texas/E.Schlegel et al; Optical: NASA/STScI hide caption

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X ray: NASA/CXC/Univ of Texas/E.Schlegel et al; Optical: NASA/STScI

The Mars rover InSight will not launch as scheduled in March. A seismometer it was supposed to carry has experienced a series of vacuum leaks and cannot be repaired in time. Yang Lei/Xinhua/Landov hide caption

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Yang Lei/Xinhua/Landov

A detail of an image captured by NASA's Curiosity Mars rover shows exposed layers of mudstone and sandstone in contact with one another. NASA/JPL-Caltech/MSSS hide caption

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NASA/JPL-Caltech/MSSS

NASA Is Seeking Astronauts. Do You Have The Right Stuff?

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Ceres, with bright spots in its Occator Crater, is seen here in a "false color" image that reflects its surface composition. New analysis says the spots are caused by a type of salt. NASA/JPL-Caltech/UCLA/MPS/DLR/IDA hide caption

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NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

Pluto's shoreline of Sputnik Planum is seen in the highest-resolution images yet to come from New Horizons. John Spencer of the Southwest Research Institute says the details support the idea that the mountains "are huge ice blocks that have been jostled and tumbled and somehow transported to their present locations." NASA/JHUAPL/SwRI hide caption

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NASA/JHUAPL/SwRI

A building called Sustainability Base, at NASA's Ames Research Center in Mountain View, Calif., has an energy-efficient design that allows in sunlight. So for most of the year, the interior is illuminated by natural light. Dominic Hart/NASA hide caption

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Dominic Hart/NASA

NASA Uses Lessons From Space To Design An Efficient Building

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