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

Henrietta Swan Leavitt, an astronomer ahead of her time, discovered the relationship between a star’s brightness and its fluctuation period. This breakthrough allowed Edwin Hubble to measure galaxy ...

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.

Circa 1945: Astronomer Dr. Edwin Powell Hubble sitting in a chair at a desk reading a journal. A staff member at Mt. Wilson Observatory, he was the first scientist to offer observational evidence ...

Yet, a century ago, its discovery by Edwin Hubble, then an astronomer at Carnegie Observatories, opened humanity's eyes as to how large the universe really is, and revealed that our Milky Way ...

To celebrate the 100-year Edwin Hubble discovery that Andromeda was a galaxy outside our own, astronomers release the most detailed Andromeda Galaxy image ever.

The flickering star is 2.2 million light-years away and is 1/100,000th the brightness of the faintest star visible to the human eye. Legendary Carnegie Science astronomer Edwin Hubble from the ...