Streaks caused by satellites are visible in a image taken with the Vera C. Rubin Observatory in the foreground. Credit: RubinObs/NSF/DOE/NOIRLab/SLAC/AURA/W. O ...
Hubble proved Andromeda is a separate galaxy by identifying a Cepheid variable star within it. Cepheid variables have a period-luminosity relationship: longer period means greater brightness. Knowing ...
Cepheid variables are a type of star that undergo regular pulsations. The length of a Cepheid’s pulsations is always related to its intrinsic, or absolute, brightness in a simple way: The longer its ...
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