The universe’s expansion rate was supposed to be a solved problem, yet the latest high precision map of the early cosmos has ...

As a cold pour hits the glass at The Sycamore in the Mission District, chatter rises, lights dim slightly, and Astronomy on Tap eases into motion, blending a little stargazing spirit with a laid-back ...

The waning moon shines close to the king of the planets on Dec. 7. Don't miss Jupiter shining close to the waning gibbous ...

In the leading model of cosmology, most of the universe is invisible: a combined 95% is made of dark matter and dark energy.

Find out what's up in your night sky during December 2025 and how to see it in this Space.com stargazing guide.

Bright stars and a lone bright planet are visible at dusk as December begins. The Summer Triangle of Vega, Altair and Deneb ...

On most nights, city skies hide the stars. Streetlights, buildings, and cars fill the air with artificial glow that drowns ...

A good satellite tracker app can turn your phone into a personal guide to the cosmos, showing you everything from the ...

U.S. Senators John Hickenlooper and Mike Crapo have reintroduced a bill to limit the number of satellites you can see in the sky.

Alligator Alcatraz is causing light pollution in one of the first designated "dark skies" in the eastern United States.