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Solstices and equinoxes seen from space

See how sunlight falls on Earth's surface during the solstices and equinoxes, and get a better understanding of why Earth's tilt causes the seasons.

Editors of EarthSky

December 21, 2025

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!

Rachel Duensing

December 19, 2025

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.

Kelly Kizer Whitt

December 18, 2025

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.

Shireen Gonzaga

December 18, 2025

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!

Editors of EarthSky

December 18, 2025

Killer whales and dolphins hunt together in a rare alliance

Killer whales and dolphins have been observed hunting together, sharing prey and skills in a rare and remarkable display of inter-species cooperation.

Cristina Ortiz

December 15, 2025

Polar bear DNA changing in response to climate change

A new study has found that polar bear DNA might be evolving to help these creatures adapt to the stresses of our changing climate.

EarthSky Voices

December 14, 2025

This moss survived in space for 9 months

In an experiment on the outside of the International Space Station, a species of moss survived in space for 9 months. And it could have lasted much longer.

Paul Scott Anderson

December 12, 2025