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RR Lyrae star

المؤلف:  Simon Singh

المصدر:  Big Bang

الجزء والصفحة:  p-431

2026-10-31

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RR Lyrae star A type of variable star less luminous than a Cepheid variable, and with a period between 9 and 17 hours. The inability to detect any RR Lyrae stars in the Andromeda Galaxy in the 1940s was an important clue that the galaxy was more distant than previously thought.