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

For humans, the most important star in the universe is our sun. The second-most important star is nestled inside the ...

The Universe really seems to be expanding fast. Too fast, even. A new measurement confirms what previous -- and highly debated -- results had shown: The Universe is expanding faster than predicted by ...

The universe really seems to be expanding fast. Too fast, even. A new measurement confirms what previous—and highly ...

New measurements show that the expansion rate of the universe is faster than can be explained by our current understanding of ...

Hubble Space Telescope mapped Andromeda, revealing a chaotic history shaped by mergers. A 2.5-billion-pixel mosaic shows 200 ...

In 1929, Edwin Hubble discovered from observations of distant galaxies that the Universe was expanding. This baffled astronomers and the public alike. Then in 1998, another wrinkle: Two different ...

The Universe really seems to be expanding fast. Too fast, even. A new measurement confirms what previous — and highly debated ...

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.

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. Once dismissed as a nearby "spiral nebula ...