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

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.

"It means cleaning house, narrowing the viable paths forward, and no longer spending energy on what are evidently dead ends." ...

A network of powerful ground-based telescopes captured rare starspot-crossing events on TOI-3884b, revealing cooler patches ...

Geminid meteors can be seen for most of the first half of the month with an expected peak after midnight on December 14. The radiant is well up in the eastern sky by late evening, and in clear skies ...

When NASA engineers want to test a concept for exploring the Red Planet, they have to find ways to create Mars-like ...

The puzzling electric charge on clouds of interstellar gas can be explained by the passage of two hot, bright stars close to ...

All 88 internationally recognised constellations have European origins. But First Nations astronomy tells older, beautiful ...

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