For half the world, the Sun will be briefly reduced to a blazing ring surrounding a sombre disk on Friday, when an annular eclipse races from central Africa to eastern Asia, astronomers say.
Space Exploration
Jan 13, 2010
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(PhysOrg.com) -- The corona is the hot outer region of the sun's atmosphere. The corona is threaded by magnetic fields that loop and twist upwards from the sun's surface, driven by motions of its dense atmosphere.
Astronomy
Dec 11, 2009
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What are asteroids made of? Asteroids are made mostly of rock—with some composed of clay and silicate—and different metals, mostly nickel and iron. But other materials have been found in asteroids, as well.
Space Exploration
Sep 14, 2015
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