Besides being a point of light, a star is a luminous, spherical mass of plasma, enough to hold itself together under its own gravity. On its own, though, gravitational rounding isn't enough. What ...

XRISM’s high-precision X-ray data revealed unusually strong signatures of chlorine and potassium inside the Cassiopeia A supernova remnant. These levels are far higher than theoretical models ...

How a medieval Oxford friar used light and color to find out what stars and planets are made of ...

Scientists working with the James Webb Space Telescope discovered three unusual astronomical objects in early 2025, which may ...