The Hubble Space Telescope has been snapping pictures of the universe for the best part of 35 years, and now astronomers have completed a magnificent 417-megapixel photomosaic of the Andromeda galaxy.

Hubble's survey of Andromeda focused on 36 dwarf galaxies (circled in yellow) that share Andromeda's environment. Unexpectedly, all of the galaxies appear to be arranged on a plane, orbiting in ...