Scientists have discovered an ultra-compact quadruple star system where three stars fit within Mercury's orbit.

Astronomers have reported observations of a rare star system consisting of one star orbiting a system of three more tightly bound stars. This quadruple star system is described in a new study, ...

The four-star system features three stars in stable orbits, plus a fourth at a distance equal to Jupiter's orbit around our Sun. Reading time 2 minutes Astronomers have identified a rare, tightly ...

It's a scene that could evoke popular fantasy stories, with sparkling stars shining above misty mountaintops, but the James Webb Space Telescope image you see above is of a very real part of our ...