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Interview with Christyl Johnson

Christyl Johnson has been assistant associate administrator in the Office of the Administrator at NASA since fall of 2005. She joined NASA in 1990, designing and building laser systems for remote sensors at Langley Research Center.

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Seeing Through the Haze: How Counterfactual Thinking Can Help NASA Prepare for the Unexpected

By William H. Gerstenmaier, Scott S. Goodwin, and Jacob L. Keaton Before the English explored Australia in the 1600s, it was held as an indisputable fact in Europe that all swans were white.

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To Stay or Go? A UAV Science Project Story

By Tony Kim What would you do if you were a scientist and had just been told by the safety authority that you can only search above the ocean for the science data that you can only get over land?

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Applying the Secrets of Hubble’s Success to Constellation

By Frank J. Cepollina From its ignominious beginnings to its triumphant redemption, the story of the Hubble Space Telescope is known around the world. What is less well known is the story behind the story—the elements that made Hubble’s ultimate success possible.

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Managing—and Learning from—a Lunar Reconnaissance Orbiter Risk

By Charles Tucker Spinning the upper stage of a rocket in flight is one way to stabilize the vehicle, just as a bullet spins to stay on course. But liquid propellant sloshing around in a spacecraft’s fuel tanks produces a wobble, or nutation, that can cause instability and alter flight trajectory. The rate of wobble […]

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The Road to GRACE

By Edgar S. (AB) Davis On March 17, 2002, twin satellites comprising the flight segment of the Gravity Recovery and Climate Experiment (GRACE) were launched by a Russian Rockot launch vehicle from the Plesetsk Cosmodrome into orbit 300 miles above the earth.

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The Applied Meteorology Unit: True Technology Transfer

By Carol Anne Dunn and Francis J. Merceret Mark Twain once said, “Everyone talks about the weather but nobody does anything about it.”

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Juno: Making the Most of More Time

By Rick Grammier Juno was selected in 2005 with an initially scheduled launch in 2009. Almost immediately, though, NASA Headquarters warned us that budgetary issues would delay the launch a year or two and asked the project team to prepare a cost assessment for a 2010 launch.

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Ask interactive
ASK Interactive

NASA in the News In April, Professor Stephen Hawking, one of the world’s foremost cosmologists and astrophysicists, spoke about “Why We Should Go Into Space” as part of NASA’s 50th anniversary lecture series.

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