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 ...

A century ago, Edwin Hubble unveiled a groundbreaking discovery that revolutionized humanity’s understanding of the cosmos. His identification of a faint star in the Andromeda Galaxy, known as V1, ...

The Tarantula Nebula, also known as 30 Doradus, is revealed in an unusual light in this exceptionally deep Chandra X-ray ...

In the century since Hubble’s pioneering work, astronomers like me have learned that the universe is vast and contains trillions of galaxies. Nature of the nebulae In 1610, astronomer Galileo ...

Bring the Moon and planets into closer view, spot stunning star clusters and observe distant galaxies and nebulas with your own eyes — you can even photograph your subject with a smart telescope.

Nebulae are gigantic clouds of gas and dust that exist in space between stars. Check out 7 mesmerizing photos of this cosmic ...

Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they were independent galaxies, extremely large and distant. At the time ...