News tagged with black holes

The entropy of black holes

Yesterday I talked about black hole thermodynamics, specifically how you can write the laws of thermodynamics as laws about black holes. Central to the idea of thermodynamics is the property of entropy, which can be related ...

dateSep 12, 2014 in Astronomy
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Will the real monster black hole please stand up?

(Phys.org)—A new high-energy X-ray image from NASA's Nuclear Spectroscopic Telescope Array, or NuSTAR, has pinpointed the true monster of a galactic mashup. The image shows two colliding galaxies, collectively called Arp ...

dateJan 08, 2015 in Astronomy
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Dark matter guides growth of supermassive black holes

Every massive galaxy has a black hole at its center, and the heftier the galaxy, the bigger its black hole. But why are the two related? After all, the black hole is millions of times smaller and less massive than its home ...

dateFeb 18, 2015 in Astronomy
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Seeking proof for the no-hair theorem

According to general relativity, a black hole has three measurable properties: mass, rotation (angular momentum), and charge. That's it. If you know those three things, you know all there is to know about the black hole. ...

dateSep 09, 2014 in Astronomy
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Radio astronomers see black hole come to life

42 million light years away, 20 million times the mass of the Sun, and coming back to life. A team of radio astronomers, led by Dr Megan Argo of the Jodrell Bank Centre for Astrophysics, are watching a previously dormant ...

dateJul 09, 2015 in Astronomy
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Telescopes give shape to furious black hole winds

NASA's Nuclear Spectroscopic Telescope Array (NuSTAR) and ESA's (European Space Agency) XMM-Newton telescope are showing that fierce winds from a supermassive black hole blow outward in all directions—a phenomenon that ...

dateFeb 19, 2015 in Astronomy
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