In the close Universe, the distance typically is a predictor of speed: more distant galaxies recede more rapidly. Another rule around the Milky Way has long been strangely compliant, however. Most of ...

Ultra-faint dwarf galaxies orbiting the Milky Way are cosmic fossils. New simulations reveal how these tiny systems reflect ...

For years, astronomers have observed the strange motion of Andromeda, the Milky Way’s closest large galactic neighbor. While most galaxies in the universe are receding due to the expansion of space, ...