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

Though tiny, this newfound satellite galaxy around M31 offers big lessons — and questions — about how galaxies evolve.

A Swarm of Dwarf Galaxies Buzz Around Our Milky Way's Twin Imagine the Milky Way and Andromeda as two massive aircraft ...

An ambitious new survey by the Hubble Space Telescope offers the first bird's-eye view of all known dwarf galaxies orbiting ...

This offers forensic clues as to how our Milky Way galaxy and Andromeda have evolved differently over billions of years. Our Milky Way has been relatively placid. But it looks like Andromeda has ...

Astronomers have made a surprising discovery that challenges current theories of galaxy formation. A colossal disk-shaped ...

The findings reveal unusual chemical signatures and offer new insights into the behavior of novas beyond the Milky Way.

The Andromeda galaxy, seen here by ... like a game of bumper cars — compared with the relatively placid evolution of the galaxies circling the Milky Way. The findings, published in The ...

Andromeda XXXV, the faintest and smallest known satellite galaxy in the Andromeda system ... composed of a few billion stars, compared to the hundreds of billions of stars in large galaxies like the ...

Astronomers suspect Andromeda had a major collision with another galaxy relatively recently, perhaps 2 to 5 billion years ago. The Milky Way, on the other hand, probably hasn't had a run-in with ...

NASA's Hubble Space Telescope has uncovered 36 new dwarf galaxies around Andromeda and ongoing star formation within them, contradicting previous theo ...