How did a Cepheid variable star help Edwin Hubble prove the Andromeda Nebula was a galaxy? Roger BradySan Quentin, California ...

Hubble's optical stability, clarity, and efficiency made this ambitious survey possible. This work included building a precise 3D mapping of all the dwarf galaxies buzzing around Andromeda and ...

The Andromeda galaxy is also known as Messier 31. It is a spiral galaxy located about 2.5 million light-years from Earth. On ...

Hubble's sharp imaging capabilities can resolve more than 200 million stars in the Andromeda galaxy, detecting only stars brighter than our Sun. They look like grains of sand across the beach.

“For example, Chandra’s X-rays reveal the high-energy radiation around the supermassive black hole at the center of M31 as ...

A family portrait of the Andromeda galaxy and its orbiting dwarf satellites raises questions about how galaxies evolve.

The Andromeda Galaxy, the Milky Way's closest galactic neighbor, glows brightly in a new Hubble Space Telescope image with swathes of ionized gas that fuel star formation.

NASA: 'Magnificent' Andromeda galaxy in pictures Hubble, with its sharp imaging capabilities, detected more than 200 million stars in the Andromeda galaxy that are brighter than Earth's sun.

The most detailed panorama of the entire Andromeda galaxy is packed with science that could revolutionize our understanding of how spiral galaxies across the universe form and evolve.

Surrounding the Andromeda galaxy, three dozen tiny galaxies aren't behaving the way scientists expected. NASA 's Hubble Space Telescope has trained on Andromeda for a deep dive into how its ...