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doit_the_clown doit_the_clown
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7 years ago
Many rich clusters of galaxies show extensive X-ray emission. What gives rise to this emission?

(a)   Hot intergalactic gas at temperatures of up to 100 million K.
(b)   Energetic electrons spiralling in intergalactic magnetic fields.
(c)   Hot O and B stars in the spiral galaxies in the cluster.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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hyponoticahyponotica
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7 years ago
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