Hubble revealed a universe of galaxies that existed beyond ours — but he couldn't have done it without a little help.

Edwin Powell Hubble is renowned for determining that there are other galaxies in the Universe beyond the Milky Way, and for observing that the universe is expanding at a constant rate. Hubble was ...

Yet, a century ago, its discovery by Edwin Hubble opened humanity's eyes as to how large the universe really is, and revealed that our Milky Way galaxy is just one of hundreds of billions of ...

Edwin Hubble's discovery of a Cepheid variable star in the Andromeda galaxy in 1923 revealed that the universe extends far beyond the Milky Way, fundamentally altering our understanding of the cosmos.