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How massive can black holes get?

Without the light pressure from nuclear fusion to hold back the mass of the star, the outer layers compress inward in an instant. The star dies, exploding violently as a supernova.

dateAug 11, 2015 in Astronomy
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Tracking a gigantic sunspot across the Sun

An active region on the sun – an area of intense and complex magnetic fields – rotated into view on Oct. 18, 2014. Labeled AR 12192, it soon grew into the largest such region in 24 years, and fired off 10 sizable solar ...

dateOct 31, 2014 in Space Exploration
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In the realm of eternal ice

On 6 November 2010, the light of the star known as NOMAD1 0856-0015072 in the Cetus constellation dimmed. What had happened? A dwarf planet at the edge of the solar system had moved in front of the distant star - its name: ...

dateApr 23, 2015 in Space Exploration
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Searing sun seen in X-rays

X-rays light up the surface of our sun in a bouquet of colours in this new image containing data from NASA's Nuclear Spectroscopic Telescope Array, or NuSTAR. The high-energy X-rays seen by NuSTAR are shown in blue, while ...

dateJul 08, 2015 in Astronomy
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