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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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SOHO image: Here comes the sun

The Solar and Heliospheric Observatory (SOHO) has been watching the Sun for almost 20 years. In that time it has seen solar activity ramp up and die down repeatedly. Its Extreme ultraviolet Imaging Telescope has taken images ...

dateJul 13, 2015 in Space Exploration
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Once around the sun with Jupiter

For Jupiterians (Jovians?) a trip around the sun takes 12 Earth years. If you were born today on the planet or one of its moons, you'd turn one year old in 2027 and reach the ripe old age of 12 in 2111.

dateJul 09, 2015 in Space Exploration
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Catching Earth at aphelion

Do you feel a little… distant today? The day after the 4th of July weekend brings with it the promise of barbecue leftovers and discount fireworks. It also sees our fair planet at aphelion, or its farthest point from the ...

dateJul 07, 2015 in Space Exploration
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Image: Increasingly active Comet 67P

On 13 August 2015, Comet 67P/Churyumov–Gerasimenko will reach its closest point to the Sun along its 6.5-year long orbit. It will be around 185 million km from the Sun at 'perihelion', between the orbits of Earth and Mars.

dateJul 01, 2015 in Space Exploration
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Still a filament arrow?

On May 28, 2015 (above left), the sun, as seen by NASA's Solar Dynamics Observatory, showed a pair of filaments in the form of an arrow. The filaments appeared to remain stable as they rotated around to the far side of the ...

dateJun 22, 2015 in Space Exploration
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