A very small body, far from the sun in an icy outer realm of the solar system, has mysteriously grown an atmosphere — and scientists are stumped as to how

Astronomers have unveiled one of the largest cosmological simulation datasets ever created, offering an expansive new tool to explore how the universe evolved across billions of years. Produced by the

A new type of self-interacting dark matter could provide solutions to three very different cosmic puzzles, new research suggests. The first mystery that could be solved involves an ultradense clump