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The luminosity of a Seyfert galaxy varies with a regular period of months or years.
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Q24: Why do Cepheids pulsate?
Q24: The proton-proton chain for fusing hydrogen into
Q35: How does Venus release its interior heat?<br>A)
Q40: Which term is described as small, icy
Q57: Galactic collisions _.<br>A) are very rare, since
Q68: Saturn has fewer, but stronger winds than