Description:
Amateur astronomy equipment, techniques, info, etc.
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Cheap Knowledge
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The energy released in one hour by just a single sunspot is equal to all the electrical power that will be used in the United States over the next million years.
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Astronomers studying 17 supernova remnants... a surprising discovery
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...Shadows. Astronomers studying 17 supernova remnants, both in and near the Milky Way, have made a surprising discovery. By analyzing the shape of the remnants--created when massive stars exploded--they could tell what type of supernova caused the debris cloud. As they reported recently in The Astrophysical Journal Letters, a supernova known as a type Ia--caused... more »
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