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Last year, a fountain of dust was spotted streaming from Rosetta’s comet, prompting the question: how was it powered? Scientists now suggest the outburst was driven from inside the comet, perhaps released from ancient gas vents or pockets of hidden ice.

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This mosaic of Thor's Helmet was created using images acquired in October and November View additional information. Adam Block / Mount Lemmon SkyCenter / University of Arizona

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Dark Matter in a Simulated Universe Illustration Credit & Copyright Tom Abel & Ralf Kaehler (KIPAC, SLAC), AMNH Explanation: Is our universe haunted? It might look that way on this dark matter map.

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Little Ghost Nebula (NGC is a planetary nebula in the constellation Ophiuchus. Round and planet-shaped, the nebula is also relatively faint. The Little Ghost Nebula should not be confused with the Ghost Nebula or the Ghost Head Nebula (NGC

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The galaxy NGC 4993 is located about 130 million light-years from Earth. On August the Laser Interferometer Gravitational-Wave Observatory detected gravitational waves from a neutron star collision within this galaxy. The event also resulted …

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Astronomy picture of the day - 2017 October 22 - Two Black Holes Dancing in 75