Photo: #This photo of Earth was taken by the Apollo 17 crew on Dec. 7, 1972. It's widely known as "The Blue Marble."
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This photo of Earth was taken by the Apollo 17 crew on Dec. 7, 1972. It's widely known as "The Blue Marble." (Photo courtesy of Earth Sciences and Image Analysis Laboratory, NASA)

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Search for planets like Earth

Broadcast: Midmorning, 03/23/2009, 10:45 a.m.

Midmorning checks in with astronomer Ken Croswell about the recently launched Kepler space telescope, which will search other solar systems for Earth-size planets.

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  • Ken Croswell: Astronomer and author of several books on space. His latest book is "Ten Worlds."

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