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Astronomy Essentials
2025 December solstice: All you need to know
Happy solstice! The 2025 December solstice will fall on December 21. It's the shortest day for the Northern Hemisphere. Celebrate the seasons!
December 20, 2025
Sun
Sun news: 2 M flares! Sun activity jumps to moderate
Sun news December 20, 2025: Sun activity jumped up to a moderate level, thanks to a couple of M flares during the past day.
Space
Interstellar object Comet 3I/ATLAS passed Earth December 19
Interstellar object Comet 3I/ATLAS makes it closest pass by Earth today (December 19, 2025). How close will it come? And where will it go after this?
December 19, 2025
Earth
Will the U.S. have a white Christmas in 2025? Find out here!
Will the U.S. have a white Christmas in 2025? Most of the U.S. will have a green and relatively warm Christmas, but snow is possible in some areas. More here!
December 19, 2025
Constellations
Triangulum the Triangle in northern skies
The constellation Triangulum lies close to overhead in northern skies on December evenings. It contains the Triangulum galaxy, a gorgeous pinwheeling spiral.
December 19, 2025
Earth
Hotspots for Category 6 storms are growing
Category 6 storms - or extremely strong Category 5 hurricanes on the current scale - arise in hotspots on the globe, and those spots are growing.
December 18, 2025
Earth
These giant sea reptiles lived in freshwater rivers, too
Scientists thought mosasaurs - giant sea reptiles - lived in oceans. But the discovery of fossils in North Dakota shows they may also have lived in freshwater.
December 18, 2025
Tonight
Year’s shortest season to start at December solstice
The year's shortest season - between the December solstice and March equinox - is about 89 days. It's 5 days shorter than the longest season.
December 18, 2025
Earth
What’s a green flash and how can I see one?
Have you ever seen the green flash from a setting sun? Learn how to see one here, plus how they appear, and enjoy some great photos and watch a video!
December 18, 2025
Astronomy Essentials
December has the longest days (wherever you live)
The longest days accompany the winter solstice. In December, a day - a whole cycle of day and night - is about half a minute longer than the average 24 hours.
December 18, 2025
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