Earth and our entire Milky Way galaxy may sit inside a mysterious giant hole which makes the cosmos expand faster here than ...

Particular stars called Cepheid variables allow astronomers to determine distance, and Hubble spotted one of these within M31 ...

The expanding universe is one of the most fascinating and far-reaching discoveries in modern science. At its core lies a ...

And with that beginning came an ancient, renewed question: if there was a starting point, who or what started it?This ...

What we saw in the DESI experiments, and now strengthened by our South Pole Telescope observations, is that dark energy is ...

A hundred years ago, astronomer Edwin Hubble revealed a universe of galaxies that existed beyond ours. His influence in astronomy continues to this day.

However, although photons of light existed since the first second after the Big Bang, they could not yet shine across the ...

In what already has been a stellar career, University of Delaware physicist William H. Matthaeus has been elected to membership in the National Academy of Sciences, one of the most prestigious honors ...

But after work led by Edwin Hubble proved the universe was expanding, Einstein abandoned his fudge factor (even calling it his “greatest blunder”).

Albert Einstein is arguably the most influential scientist of the 20th century. His general theory of relativity changed our understanding of space and time, becoming one of the two pillars of ...

Only after the American astronomer Edwin Hubble’s 1929 discovery that other galaxies are receding from our own—that the universe is indeed expanding—did Einstein relent.

One century after Edwin Hubble revealed his astonishing discovery of a cosmos beyond the Milky Way, the most precise measurements still can’t agree on how fast galaxies are moving. One century ...