The James Webb Space Telescope has captured the light of a star that exploded when the universe was still in its cosmic youth ...

Webb’s latest observations reveal a hellish world cloaked in an unexpected atmosphere: TOI-561 b, an ultra-hot rocky planet ...

Every week, Space.com delivers the latest discoveries, launches, and cosmic curiosities from across the universe. From ...

The 13th day of the 18th annual Space Telescope Advent Calendar features part of a dense cluster of galaxies—a wide variety of shapes, colors, and distances.

The 2026 program, with its mix of historic commemorations, is expected to draw interest from regular collectors and new audiences.

New gravitational lensing measurements by the TDCOSMO Collaboration support the Hubble Tension, confirming differences between Early and Late Universe Hubble Constant values using updated ...

The telescope captured near-infrared light from one of the earliest stars seen to explode in the history of the universe.

Interstellar object 3I/ATLAS is making its closest approach to Earth in just over a week from now, coming within 167 million ...

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Caption: This artist’s concept shows what a thick atmosphere above a vast magma ocean on exoplanet TOI-561 b could look like.

The space agency said supernovas typically brighten rapidly over a period of several weeks before they slowly start to dim. This example, however, took months to ...

A stronomers using the JWST have traced the source of a long-duration gamma-ray burst back to a supernova that exploded ...