SpaceWe may have to rewrite our understanding of gravity There is a mismatch between two ways of measuring galactic mass. Dark matter is one way to solve it, but so is rewriting the laws of gravity, says Chanda Prescod-Weinstein Comment
SpaceRare images show role of collisions in galactic evolution These six rare and exquisite images of galactic evolution were taken by the Hubble Space Telescope. They show what happens when galaxies collide and merge Regulars