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

From 400-year-old globes to cosmic funeral shrouds, how the Osher Map Library in Maine shows people that maps aren't just for ...

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.

On November 18, observers are advised to look for Leonid meteors in the morning. Also on November 18, bright Venus (magnitude –3.9) will appear approximately 0.8° to the left of the 2.8 magnitude star ...

On November 16, a waning crescent Moon, exhibiting earthshine, will pass 1.2° south of Spica in the early morning sky, with Venus also visible and appearing 98 percent illuminated. During the evening ...