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How cold are black holes?

The very idea that a black hole could have a temperature strains the imagination. I mean, how can something that absorbs all the matter and energy that falls into it have a temperature? When you feel the warmth of a toasty ...

dateSep 05, 2016 in Space Exploration
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A blazing gamma-ray source

Blazars are galaxies whose central, supermassive black holes are accreting material from surrounding regions. Although black hole accretion happens in many galaxies and situations, in the case of a blazar the infalling material ...

dateJun 06, 2016 in Astronomy
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Team simulates the expansion of the Universe

The Universe is constantly expanding. It changes, creating new structures that merge. But how does our Universe evolve? Physicists at the University of Geneva (UNIGE), Switzerland, have developed a new code of numerical simulations ...

dateMar 07, 2016 in General Physics
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