Around 13.7 billion years ago, something collapsed. It fell outward into the nothingness that stretched in every direction, ...

In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small ...

In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they ...

Ancient ‘white dwarf’ stars explode and die in more ways than was thought, and observing these violent cosmic deaths could ...

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 ...

“We [will be able to] move quickly and map out very large areas of the sky,” adds Josh Schlieder, the telescope’s wide-field ...

The universe appears to be expanding at a staggering speed ... It is named in honor of astronomer Edwin Hubble, who discovered in 1929 that galaxies are moving away from us at a speed proportional to ...

Credit: NASA, ESA, Imad Pasha (Yale), Pieter van Dokkum (Yale) NASA's Hubble Space Telescope managed to capture ... Galactic collisions occur frequently in the universe, but the researchers highlight ...

In early 1920s astronomy, most researchers believed our Milky Way was the entire universe. They assumed those faint spiral ... for one of those smudges in order to test the theory. When Edwin Hubble ...

For decades, scientists believed gravity would slow cosmic expansion, but in a surprising twist, they found the opposite: expansion is speeding up. Dark energy is the suspected culprit, but what is it ...