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Video: A golden arch on the sun

Magnetically charged particles formed a nicely symmetrical arch at the edge of the sun as they followed the magnetic field lines of an active region on Aug.4-5, 2015. Before long the arch begins to fade, but a fainter and ...

dateAug 13, 2015 in Space Exploration
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See Venus at her most ravishing

Venus is HUGE right now but oh-so-skinny as it approaches inferior conjunction on August 15. Like crescents? You'll never see a thinner and more elegant one, but first you'll have to find it. Here's how.

dateAug 11, 2015 in Space Exploration
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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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What is the Oort Cloud?

For thousands of years, astronomers have watched comets travel close to Earth and light up the night sky. In time, these observations led to a number of paradoxes. For instance, where were these comets all coming from? And ...

dateAug 11, 2015 in Space Exploration
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