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 rare grouping of 10 celestial bodies is captured in a stunning new photo taken during last weekend’s great planetary parade ...

The Andromeda nebula, M31, was a prominent example ... These glass plates recorded images of the night sky using a light-sensitive emulsion covering their surface. The telescope’s size let ...

let's try for one of the sky's most distant naked-eye wonders: the Andromeda Galaxy (M31) in the constellation Andromeda. This huge spiral galaxy is larger than the Milky Way and sits some 2.5 ...

NASA’s Spitzer Space Telescope has captured this stunning image of Andromeda Galaxy which is also known as M31. This image, captured by NASA's retired Spitzer Space Telescope, shows only dust which ...