An ultra-hot rocky exoplanet may be wrapped in a dense atmosphere, defying expectations about what small planets can sustain.

In the spirit of the season, the interstellar comet 3I/ATLAS is changing color as it leaves the sun behind — shifting from a ...

Webb Telescope detects an atmosphere on TOI-561 b, a scorching rocky planet once thought too small and hot to hold onto its ...

James Webb Space Telescope imagery of Pandora’s Cluster (Abell 2744) delivers three galaxy clusters and so much more. Take a ...

The James Webb Space Telescope has captured a stunning view of the N79 nebula, located in the Large Magellanic Cloud. Credit: ...

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

In smaller dark stars, when their dark matter runs out, normal nuclear fusion can begin, and they gradually become normal ...

Scientists suggest that the dark matter may have powered the universe’s first stars. This allows them to shine before nuclear ...

One of the last meteor showers of the year, the Geminids, is set to dazzle stargazers overnight on Saturday. Follow Newsweek live.

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.

Researchers employing the James Webb Space Telescope and Canada's NIRISS instrument have observed exoplanet WASP-121b getting ...

Loveland Open Lands & Trails will host a Winter Solstice Celebration “Here Comes the Sun” Sunrise Event at 7-7:45 a.m.