Planet-Hunting Space Telescope Readies for Launch

WIRED - When humans look into outer space and its amazing distant realms, sometimes all we really want to find is someplace like home.

Another planet like Earth, that is. Soon, a new NASA telescope mission called Kepler may finally make that happen.

Set to launch March 5 from Florida's Cape Canaveral Air Force Station, the $550 million Kepler telescope is designed to detect extrasolar planets that are the same size as Earth, orbiting around stars the same size as the sun, at a range similar to Earth's distance from the sun, and with orbits of about one year, like ours.

"The whole mission was designed around this goal," said Kepler co-investigator William Cochran, an astronomer at McDonald Observatory at the University of Texas at Austin. "If we find no Earth-like planets, then we can say with great confidence that Earths like ours are rare."

Although more than 300 exoplanets have been discovered around other stars, none have been quite as small as Earth, and even the ones that come close don't usually orbit in what's called the habitable zone — the range in which temperatures would be favorable for life.

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