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NASA Sends Probe to Explore Space-Time

NASA has successfully launched a satellite designed to examine the nature of space and time. The $750 million Gravity Probe B satellite will spend the next 18 months testing the fabric of space surrounding the Earth. Scientists first proposed the mission in 1959. NPR's David Kestenbaum reports.

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David Kestenbaum is a correspondent for NPR, covering science, energy issues and, most recently, the global economy for NPR's multimedia project Planet Money. David has been a science correspondent for NPR since 1999. He came to journalism the usual way — by getting a Ph.D. in physics first.
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