Metro Phoenix's mighty saguaros have been falling at a rate that has alarmed casual observers. But experts say people need to turn their attention to the young ones that aren't growing yet.
The encounter is an out-of-this-world example of right place, right time — as Mars zips past Jupiter, Earth will be in the perfect spot to see the two planets look as if they are within arm's reach.
Iceberg A23a — equivalent to the size of Rhode Island — has been near the South Orkney Islands since January, completing one full rotation every 24 days or so.
Researchers say an ancient calendar discovered in southern Turkey may also memorialize a devastating comet strike that hit Earth nearly 13,000 years ago.
At the Olympic Games, concession stands serve drinks in reusable plastic "eco-cups." It's a sustainability measure, Olympic organizers say, but environmentalists say they increase waste.
Researchers from Oakland University surveyed hundreds of cat caregivers and found that cats exhibited behaviors associated with grief after a fellow cat or dog in the household died.
The meteor shower creates an opportunity to sit outside at night and watch shooting stars. It's also an opportunity for researchers to do some science.
Starliner's test pilots, Butch Wilmore and Suni Williams, should have returned by mid-June. NASA is weighing its options for returning the two, including a ride home in a rival SpaceX capsule.
The Chinese American physicist, who in 1957 became the second-youngest scientist to receive a Nobel Prize, died on Sunday at his home in San Francisco.
Kauli Vaast of Tahiti and Team USA's Caroline Marks both won gold on Monday, capping off a dramatic few days of competition that even included a brief appearance by a whale.
