Gamma-ray bursts are the most powerful explosions known in the Universe and a NASA satellite called Swift is the Gamma-ray burst look-out. Originally tasked with the mission to target 200 bursts, on April 13, 2010 Swift greatly outpaced that goal and discovered its 500th burst. This video shows all 500 bursts detected by Swift and identifies some of the more notable bursts.To read more about Swift's 5 years and 500 Gamma-ray bursts, visit:http://www.nasa.gov/mission_pages/swift/bursts/500th.htmlWant more? Subscribe to NASA on iTunes!http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewPodcast?id=283424434Or get tweeted by NASA:http://twitter.com/NASAGoddard
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