The two keys to Edwin Hubble 's breakthrough discovery were forged by others in the 1910s. The first key, the period-luminosity scale discovered by Henrietta Leavitt, allowed astronomers to calculate ...

Add Yahoo as a preferred source to see more of our stories on Google. The Andromeda galaxy helped Edwin Hubble settle a great debate in astronomy. Stocktrek Images via Getty Images A hundred years ago ...

The observations that American astronomer Edwin Hubble made on the night of October 5-6, 1923 and one that he had made the ...

On the night of Oct. 5 to 6, 1923, Edwin Hubble discovered a new star — and revealed the utter vastness of the universe. Hubble was looking at the cosmos with the 100-inch Hooker telescope at the ...

For humans, the most important star in the universe is our sun. The second-most important star is nestled inside the Andromeda galaxy. Don't go looking for it—the flickering star is 2.2 million ...

Add Yahoo as a preferred source to see more of our stories on Google. Circa 1945: Astronomer Dr. Edwin Powell Hubble sitting in a chair at a desk reading a journal. A staff member at Mt. Wilson ...

Look up on a clear night away from city lights, and you might spot a faint smudge that isn't a star at all. It's a galaxy, a ...

"I would rather be a second-rate astronomer than a first-rate lawyer."Many of you have likely heard the name "Hubble Space Telescope."The person for whom it is named is the American astronomer Edwin ...

Read a National Geographic magazine article about general relativity and get information, facts, and more about dark matter.

This article was originally featured on The Conversation. A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known universe. At a meeting of the American Astronomical ...

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 ...