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On this day in space! Nov. 21, 1676: Astronomer (accidentally) discovers speed of light
On Nov. 21, 1676, the Danish astronomer Ole Rømer discovered the speed of light.
How did this 20-light-year-wide 'Diamond Ring' form in space? Maybe a cosmic bubble burst
"All that remained was the particular flat shape."
Earth just got hit by a stealth solar storm no one saw coming
The quiet arrival offers another indication that the sun is moving into the declining phase of its 11-year cycle.
NASA’s Artemis 2 moon rocket comes together | Space photo of the day for Nov. 21, 2025
The Orion crew module gets stacked onto the Space Launch System in preparation for the upcoming Artemis 2 mission in early 2026.
Black Friday 2025 deals you can already get: Telescope deals, binocular discounts, camera offers and more
Deals We've scoured the net for the best Black Friday and Cyber Monday deals on space-related gear, from telescopes to cameras and more.
Night sky for tonight: Visible planets, stars and more in this evening's sky
Find out what you can see in the night sky for tonight, from planets and stars to dazzling meteor showers.
James Webb Space Telescope spots a gassy baby galaxy throwing a tantrum in the early universe
The astronomers estimate that this galaxy will deplete itself of gas in only a few hundred million years.
Northern lights forecasts, alerts, and geomagnetic storm warnings - live updates
The latest aurora forecast for tonight help you make sure you're in the right place at the right time to see the northern lights.
