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Dictionary

RR Lyrae star

Astron.one of a group of pulsating variable stars found in the halo of the Milky Way, with periods between 1.2 and 30 hours; all have approximately the same luminosity and are therefore used for measuring distances. Also called cluster variable.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

-rrhoea

R.R.R

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