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Strong evidence that the Moon’s volcanic activity slowed gradually

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Extreme energy

A pulsar in M82 beams with the energy of about 10 million Suns

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Active area

Rosetta captures a region of jet activity the neck of Comet 67P

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Astro 101: Cosmic Rays

Subatomic particles with ridiculous amounts of energy

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Super star

Swift mission observes mega flares from a mini star

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Fruitful flyby

NASA's three Mars orbiters safely study Comet Siding Spring flyby

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PICTURE OF THE DAYsee all »

The Heart Nebula

The Heart Nebula (IC 1805), seen here in the false colors of the Hubble palette, is an emission nebula in the constellation Cassiopeia the Queen. It lies 7,500 light-years away and glows because of the energy emitted by a small cluster of stars at its center. (APM 80/500 at f/6.25, Atik 383L+ CCD camera, Hydrogen-alpha/Oxygen-III/Sulfur-II image with exposures of 390, 420, and 450 minutes, respectively)
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