Andromeda XXXV is only about 20,000 times more massive than our Sun—very small, even for a satellite galaxy. For comparison, ...

When we observe distant celestial objects, there is a possible catch: Is that star I am observing really as reddish as it ...

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 ...

There is a supermassive black hole at the center of nearly every big galaxy—including ours, the Milky Way (it's called ...

Lior Shamir, a computer scientist in the Carl R. Ice College of Engineering at Kansas State University, published a study of ...

Even the little-understood Oort Cloud, at the outer edges of our solar system beyond view, has a partly spiral structure.

BEIJING -- Chinese and foreign astronomers have unveiled the first three-dimensional map of the properties of interstellar ...

He calculated M31’s distance as a prodigious 900,000 light ... His measurements marked the end of the Great Debate about the Milky Way’s size and the nature of the nebulae.

In March the bright winter constellations of Canis Major, Canis Minor, Orion, Gemini, Taurus and Auriga fill the southern sky stretching all the way to zenith — the point directly overhead. Directly ...

Quipu, Hercules, Serpens–Corona Borealis and Sculptor–Pegasus are all larger than the fifth and final superstructure highlighted in the study, the Shapley supercluster, which had previously held the ...