Tonight NASA launched a Delta II rocket with the Kepler Telescope atop it.
Kepler’s mission is to observe 100,000 stars constantly for three and a half years. It’s doing this to watch for dips in brightness caused by a planet passing in front of the star. By observing so many stars for so long, it’s expected that Kepler will about fifty Earth-sized planets with an orbit of about a year in length!
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