Earth's climate has swung between ice ages and warmer periods for millions of years, driven by subtle changes in our planet's ...

The winter solstice, or the December solstice, is the point at which the path of the sun in the sky is farthest south. At the ...

Day and night will get equal time for a brief moment Monday as much of the world heads into fall. The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere ...

It's Dec. 1, but despite the incoming snow and ice, the official start to winter is still three weeks out. Here's when winter ...

The winter solstice varies by year, between Dec. 20 and Dec. 23. It marks the shortest day and longest night in the Northern ...

Find out when the winter solstice happens in 2025 and why the shortest day of the year marks the quiet return of longer days ...

The exact moment when Earth’s most catastrophic mass extinction ended the dinosaurs’ reign 65 million years ago has remained a mystery. But now, an international team of paleontologists has pinpointed ...

Years ago, scientists noted something odd: Earth's Northern and Southern Hemispheres reflect nearly the same amount of sunlight back into space. The reason why this symmetry is odd is because the ...