A new study suggests that about 4,000 years ago, a combination of isolation, extreme weather, and the arrival of humans on Wrangel Island in the Arctic Ocean killed off Earth’s last population of mammoths.
Air temperatures in the Arctic are increasing at least twice as fast as the global average. What worries climate scientists about the Arctic summer of 2019? And why does it matter for the rest of the world?
Arctic sea ice likely reached its smallest extent for 2019 on September 18. At 1.6 million square miles (4.15 million square km), that minimum is now in a 3-way tie for 2nd-smallest in the satellite record.
Posted by Bruce McClure in Astronomy Essentials | Earth|4 weeks ago
September 23 is the equinox. The word means “equal night.” Days and nights are nearly equal now at the equinox, but not quite. Here’s why. Also, we’ve got a new word for you, “equilux.” It’s the word for when day and night are, in fact, equal.
June through August 2019 was the Northern Hemisphere’s hottest summer on record, tied with 2016. Meanwhile, in the Southern Hemisphere, the same period marked the 2nd-warmest winter in the 140-year record.
Could a collision between 2 asteroids millions of miles away cause an ice age on Earth, some 460 million years ago? A new study of earthly rocks and sediments – plus micrometeorites that fell in Antarctica – suggest it’s possible.
Have you ever seen a red rainbow? You might, if you’re outside at sunrise or sunset at a time when there’s rain in the air. Red rainbows have a surreal beauty, but their explanation is fairly ordinary. They’re created via the same physics that makes a sunset or sunrise looks red.