News tagged with black holes

The golden anniversary of black-hole singularity

When a star collapses forming a black hole, a space-time singularity is created wherein the laws of Physics no longer work. In 1965 Sir Roger Penrose presented a theorem where he associated that singularity with so-called ...

dateOct 01, 2015 in Astronomy
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Chance microlensing events probe galactic cores

Some galaxies pump out vast amounts of energy from a very small volume of space, typically not much bigger than our own solar system. The cores of these galaxies, so called Active Galactic Nuclei or AGNs, are often hundreds ...

dateJul 01, 2016 in Astronomy
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Measuring the shape of the Milky Way's black hole

At the heart of our galaxy's center is SagA*, a supermassive black hole containing about four million solar-masses of material. SgrA* is relatively faint, unlike the supermassive black holes in some other galaxies. This is ...

dateJun 24, 2016 in Astronomy
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When black holes collide

Picture the scene: two gigantic black holes, each one a good fraction of the size of our Solar System spiralling around each other. Closer and closer they draw until they touch and merge into a single, even more gigantic ...

dateSep 29, 2015 in Astronomy
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How do stars go rogue?

Rogue stars are moving so quickly they're leaving the Milky Way, and never coming back. How in the universe could this happen?

dateAug 25, 2015 in Astronomy
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