Cosmos Vastness: Hubble’s ‘Standard Candle’ Unlocks Universe Size, Oct. 5, 1923

A sequence of images displaying the star M31-V1 fluctuating in brightness across a span of weeks. Edwin Hubble made the star’s discovery in 1923.(Image credit: Image: NASA, ESA, Hubble Heritage Project; Acknowledgment: Robert Gendler)QUICK FACTS Date: Evening of Oct. 5,…




