Messier 81, a grand design spiral ... after the Big Bang—which is to say, early in the universe’s existence—well-articulated spiral galaxies existed. Though the spiral arms may not be ...

Astronomers have traced a mysterious fast radio burst to an unexpected place — an ancient, massive galaxy far removed from ...

For the first time, astronomers have traced a fast radio burst (FRB) to the outskirts of an ancient, dead, elliptical ...

Galaxies are the building blocks of the universe. Clusters of galaxies ... The other large galaxies are the Andromeda Galaxy, and Messier 33 (the 33rd entry in Charles Messier's catalog of ...

This discrepancy is measured using a metric called Sigma 8 (σ8), which tracks the clumpiness of matter. Lower-than-expected ...

Across cosmic history, powerful forces have acted on matter, reshaping the universe into an increasingly complex web of ...

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 ...

In the century since Hubble’s pioneering work, astronomers like me have learned that the universe is vast and contains trillions of galaxies ... Charles Messier also produced a catalog of ...