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TOPIC: Astronomy Videos


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Nasa's 50 years in space

The US space agency's five decades in space have given the world many memorable moving images.

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Milky way
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A Lyman-alpha blob (LAB) is a huge concentration of a gas emitting the Lyman-alpha emission line. The Lyman-alpha emission line is produced by recombination of electrons with ionised hydrogen atoms. LABs are some of the largest known individual objects in the Universe. Some of these gaseous structures are more than 400,000 light years across.

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