Some scientists believe that Andromeda experienced a major collision with another galaxy a few billion ... Hubble has provided a high-resolution 3D map of these small galaxies.

The Andromeda galaxy is surrounded by a constellation of dwarf galaxies that are arranged in a highly lopsided manner. Analysis of cosmological simulations published in Nature Astronomy reveal that ...

The Andromeda galaxy is surrounded by a constellation ... challenging existing models. High-resolution images from the Hubble Space Telescope show evidence of star cluster migration and merger ...