The rise of complex life came after a rise in oxygen levels, according to new research.
Here we go again.
Pilot Nigel Lamb, flying for Breitling, <a href="http://www.redbullairrace.com/en_US/article/lamb-beats-arch-epic-world-championship-finale">won the world championship title</a> at the 2014 Red Bull Air Race in the Austrian Alps on October 26.
The Coast Guard and Marine Police try to warn boats out of the danger zone, but sometimes they get through.
A DHC-3 Otter flies over glaciers for NASA's Operation IceBridge-Alaska surveys, which study how rising temperatures affect the Arctic.
Alan Eustace makes history with his 26-mile fall.
Another (possibly) watery moon in the outer solar system
A U.S. Air Force airman plays a victim being lifted into an HH-60G Pave Hawk during an evacuation exercise.
Even better than the official “Enter Sandman” video.
American World War I pilots joined up early by serving with Britain’s Royal Air Force.
This image from NASA's Terra satellite captured autumn's turning leaves in the Great Lakes area.
A Luxembourg company sends a payload where no amateur radio satellite has ever gone.
On the trail of a tall tale.
In 1920, Reno was the transfer point for airmail being flown between San Francisco and New York City. In this photo from the National Postal Museum, airmail employees transfer mailbags from one de Havilland to another.
During Sunday’s close approach, the view will be best from the Red Planet.
New work suggests that lavas were erupted on the Moon less than 100 million years ago.
An F-15 gets towed down Watson Boulevard in Warner Robins, Georgia. The city is leasing the Eagle from the state's Air National Guard for its new veteran's memorial.
A cheaper, easier, approach to planetary protection.
As the European Space Agency's Rosetta spacecraft zeros in on Comet 67P/Churyumov-Gerasimenko, it gets a better and better view of the rough surface its lander, Philae, will descend upon on November 12. The spacecraft took this "selfie" on October 7 using a camera on Philae, showing Rosetta's solar panels and the comet just 16 km away.
A U.S. Air Force Thunderbird performs at the Arctic Thunder Open House at Joint Base Elmendorf-Richardson, Alaska in July 2014.
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