Astronomers have found massive galaxies 3 billion years after the Big Bang that are dying from the inside out.
High-powered simulations suggest that half of the material in the Milky Way could come from other galaxies.
Evidence from observations sheds doubt on cosmic cannibalism as a source for galaxy growth, suggesting that instead galaxies grow by pulling in gas from the intergalactic medium.
A new technique lets astronomers measure nearly invisible clouds of hydrogen gas from across the universe.
Astronomers have identified 53 “super spirals” — spiral galaxies that are huge and incredibly luminous — as part of a project exploring archived observations.
Astronomers take a second look at UGC 1382 — previously considered a typical elliptical galaxy — and reassess everything they know about its size, age, and formation.