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Scientists say a brief burst of radio activity has been detected at the Arecibo radio telescope in Puerto Rico. This new report resembles previous activity detected in Australia, which has scientist debating possible causes, including solar flares, blitzars, or something even more mysterious. Brian Negin/iStockphoto hide caption

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Brian Negin/iStockphoto

Close Encounters Of The Radio Kind? Mystery Bursts Baffle Astronomers

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This composite image shows new details of the aftermath of a massive star that exploded and was visible from Earth over 1,000 years ago. Chandra X-ray Observatory Center/NASA hide caption

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Chandra X-ray Observatory Center/NASA

Dying Stars Write Their Own Swan Songs

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An image showing the distribution of massive stars in the new study. Our location within the Galaxy is circled in black. J. Urquhart et al./Background image by Robert Hurt of the Spitzer Science Center. hide caption

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J. Urquhart et al./Background image by Robert Hurt of the Spitzer Science Center.

An artist's impression of one of the super-Earth's surrounding the star Gliese 667 about 22 light years from Earth. ESO/L. Calçada hide caption

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ESO/L. Calçada

An artist's impression of a gamma-ray burst, a powerful jet of energy lasting from less than a second to several minutes. The most powerful events in the universe, they are thought to be mostly associated with the explosion of stars that collapse into black holes. A. Roquette/ESO hide caption

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A. Roquette/ESO

Venus on the eastern limb of the Sun captured by TRACE satellite. NASA hide caption

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NASA

The Venus Transit: Who Cares?

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A composite of Lyrids over Huntsville, Ala., in 2009. This year, the meteor shower will hit its peak before dawn Sunday morning. Danielle Moser/MSFC/NASA hide caption

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Danielle Moser/MSFC/NASA

Lights Off, Eyes Open: New Moon Darkens Skies For Meteor Shower

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