The Andromeda Galaxy, located 2.5 million light years away, has fascinated observers for centuries. Once believed to be part ...

Particular stars called Cepheid variables allow astronomers to determine distance, and Hubble spotted one of these within M31.

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

Since Hubble’s launch, astronomers have discovered over 1 trillion galaxies, but Andromeda stands out as the closest and most significant to our Milky Way. Visible to the naked eye on clear ...

NASA's Hubble Space Telescope has provided unprecedented details about the Andromeda galaxy's history and characteristics. Andromeda, a galaxy 2.5 million light-years from Earth, has been ...

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.

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.

The Hubble Space Telescope used quasars to make the most precise map of a galactic halo ever and realized that the Andromeda galaxy's influence stretches into that of our own Milky Way.

When we look at the stars within Andromeda, with space telescopes like Hubble, the biggest differences emerge. The stars visible in the Andromeda galaxy, in a dust-rich region and a dust-poor region.

The Hubble Space Telescope recently completed the Panchromatic Hubble Andromeda Treasury, mapping a third of Andromeda's disk and resolving over 117 million individual stars.

Scientists using NASA's Hubble Space Telescope have discovered that the immense halo of gas enveloping the Andromeda galaxy, our nearest massive galactic neighbor, is about six times larger and ...