Rather than solid arms, spiral galaxies may show density waves—regions where matter slows down and bunches up, like cars in ...

As scientists and space enthusiasts commemorate the Hubble Space Telescope's 35 years in orbit, the mission team joined in by delivering a fresh collection of awe-inspiring images. Thirty-five years ...

The clue to the central star's nomadic past comes in the form of a distinct bow shock observed adjacent to the star — a ...