Light pollution is impacting astronomy around the globe

Light pollution is affecting astronomical observatories around the world. Increasing light pollution and urban sprawl are impacting even remote sites.

Mammatus clouds are ominous and beautiful

Mammatus clouds look like bubbling, low-hanging clouds. They're often associated with thunderstorms. Learn more about them here and see photos.

Grand Canyon fire explodes north, burning thousands of acres

The Grand Canyon fire that began on July 4, 2025, has exploded northward. It's now ballooned up to more than 94,000 acres.

Tsunami triggered by magnitude 8.8 earthquake

A magnitude-8.8 earthquake struck off the coast of eastern Russia on Wednesday, July 30. The resulting 13-foot (4-meters) tsunami struck the Russian coast.

Hurricane Iona now a major hurricane, south of Hawaii

Hurricane Iona and Tropical Storm Keli are the first 2 tropical cyclones of the central Pacific hurricane season. Read more about them here.

Did arachnids originate in the sea? A new study suggests so

We think of spiders, scorpions and other arachnids as land creatures. But according to a new study, they might have originated in the sea.

What is corn sweat, and is it making the heat worse?

Corn sweat is when corn releases moisture to keep cool, but it makes people sweat as it increases the humidity in the air, making days feel even hotter.

Millions under extreme heat threat across the U.S.

Millions of people in the United States are at risk for dangerous or extreme heat on Friday, July 25, 2025, and through the weekend.

A mysterious fossil and the evolution of skin and feathers

A fossil of an ancient reptile shows a distinct crest that is made neither of feathers, scales or hair. It's forcing scientists to rethink reptilian evolution.

Can sharks smile? It’s Shark Week! Enjoy these shark videos

Can sharks smile? Not likely. But dogs, monkeys and dolphins all show expressions akin to human smiles. Learn more about sharks during Shark Week.

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