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

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 bouquet of thousands of stars in bloom has arrived. This composite image contains the deepest X-ray image ever made of the ...

Possibly one of the best-known constellations in the northern sky, Ursa Major—or the Great Bear—contains an asterism of seven ...

October belongs to Pegasus and the water constellations, which float through the southern sky after nightfall. Reigning supreme high in the south are the Great Square of Pegasus and, stretching from ...

Centaurus A: NGC 5128 is a galaxy in constellation Centaurus, discovered in 1826 by Scottish astronomer James Dunlop. Messier ...

Stare into the heart of our galaxy – the Milky Way, filled with billions of stars and mysterious deep-space wonders.

In the 1920s, astronomers thought that the Milky Way was the entire universe. Hubble's discovery revealed a much bigger ...

to precisely measure the distance to a fuzzy object in the constellation of Andromeda. Edwin Hubble seated at the 2.5-metre reflecting telescope at the Mount Wilson Observatory in California.

to precisely measure the distance to a fuzzy object in the constellation of Andromeda. He identified a star called V1, a Cepheid variable, which predictably pulsates in brightness over time ...

At a meeting of the American Astronomical Society in January 1925, a paper read by one of his colleagues on his behalf reported that the Andromeda nebula, also called M31, was nearly a million light ...

At a meeting of the American Astronomical Society in January 1925, a paper read by one of his colleagues on his behalf reported that the Andromeda nebula, also called M31, was nearly a million ...