Sunday's supermoon, combined with an 18.6-year lunar cycle, caused high tides on both sides of the Atlantic this week. There were many flood warnings and alerts in effect in the UK on Tuesday night. In eastern North America, Tropical Storm Joaquin might combine with high tides to cause flooding.

Scientists are studying the increasingly fast rate of summertime ice melt in Greenland. See a new NASA video, plus illustrations of the 2015 melt season.

Hadrosaur was a truly polar dinosaur that endured months of winter darkness and probably experienced snow.

An initial draft, a collaborative effort from scientists at 11 institutions, of a new, comprehensive evolutionary tree of life. Plus ...

Worst recorded years for U.S. wildfires are 2005, 2006, 2007, 2011 and 2012. This year has already joined that list, and wildfire season is still going strong.

“Right now, the monsoon is 12 percent below average and dropping, and [India is] headed for a pretty serious dry season,” said a researcher.

At least five people killed and 1 million evacuated, after a powerful 8.3-magnitude earthquake off the coast of Chile last night. Tsunami waves and many strong aftershocks followed. Tsunami advisory for California and Hawaii.

Wow! Check out this visual comparison of the emerging El Niño with the record-breaking El Niño of 1997-98, which created weather extremes around the globe.

They are evidence of two enormous meteorite impacts, a twin strike that happened around 460 million years ago.

The 2015 Arctic sea ice minimum summertime extent is the 4th lowest since observations from space began, according to a NASA analysis of satellite data.