Edwin Hubble's 1923 Discovery of the Universe's Vastness with Standard Candle
Originally Published 3 months ago — by Live Science
In 1923, Edwin Hubble discovered a variable star in the Andromeda galaxy, which helped prove that it was a separate galaxy from the Milky Way and enabled the calculation of the universe's vastness and expansion rate, leading to the foundational understanding of an expanding universe and the Hubble constant.