Hubble found a Cepheid in the Andromeda Nebula, using its period and brightness to calculate distance. This distance was far beyond our galaxy, proving Andromeda is a separate galaxy.

Hubble Space Telescope's 35th anniversary: See NASA's new out-of-this-world images The Hubble Space Telescope, launched 35 years ago, has blown our minds with its striking images of far-away ...

One large Milky Way galaxy or many galaxies? 100 years ago, a young Edwin Hubble settled astronomy’s ‘Great Debate.’ Hubble transformed astronomers’ understanding of the universe.

The Andromeda galaxy helped Edwin Hubble settle a great debate in astronomy. Stocktrek Images via Getty Images A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the ...

A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known universe. At a meeting of the American Astronomical Society in January 1925, a paper read by one of his ...

A century ago, humans didn't know other galaxies existed. Here's how Edwin Hubble changed that view.

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

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 observations of V1 became the critical first step in uncovering a larger, grander universe than some astronomers imagined at the time.

Back to Article List How Edwin Hubble won the Great Debate A century ago, a brash astronomer leaked a discovery that opened our view to the cosmic distance scale and the nature of galaxies.

Now, NASA has released “ Hubble Focus: The Dark Universe,” a free e-book that explores what the Hubble mission has taught scientists about dark matter and dark energy — and how those lessons ...

Hubble, for whom the Hubble Space Telescope is named, lived in the neighborhood in the early 1900s.