View Full Version : Longstanding Cepheid Mass Mystery Finally Solved

2010-Nov-24, 06:20 PM
Cepheid variable stars – a class of stars that vary in brightness over time – have long been used to help measure distances in our local region of the Universe. Since their discovery in 1784 by John Pigott, further refinements have been made about the relationship between the period of their variability and their luminosity, [...]

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