The Andromeda galaxy, also known as Messier 31 (M31), is the closest spiral galaxy to the Milky Way at a distance of about 2.5 million light-years. Astronomers use Andromeda to understand the ...

The new images taken by NASA’s Curiosity Mars rover raises fresh questions about how the Martian surface was changing ...

The new images by Curiosity show "dramatic evidence" of ancient groundwater in crisscrossing low ridges, NASA said.

The images, taken from the slopes of a mountain inside Mars’ Gale Crater, show a network of low ridges etched in a striking ...

Deep in the constellation Canes Venatici, also called the Hunting Dogs, lies the dwarf galaxy NGC 4449. It's part of the M94 ...