The astronauts named by NASA to fly on commercial spacecraft made by Boeing and SpaceX to and from the International Space Station: From left, Sunita Williams, Cmdr. Josh Cassada, Eric Boe, Lt. Col. Nicole Mann, Christopher Ferguson, Douglas Hurley, Col. Bob Behnken, Col. Mike Hopkins and Cmdr. Victor Glover.
Almost 230 feet tall and weighing more than 3 million pounds, the Falcon Heavy is more powerful than any other rocket flying today.
These three Magellanic penguin chicks died of hypothermia after a rainstorm.
Transportation Security Administration employees at work. The agency employs thousands of officers who try to spot suspicious passengers.
Fully programmable robots were on display at the Humanoids 2013 conference in Atlanta. The goal is to enable them to work effectively and even autonomously in emergency situations.
Graduation at City College in New York in 2016. A study in Iceland focusing on education suggests that parental genes may help determine how long children stay in school.
Clockwise from top, researchers Richard Roberts, Vladimir Ulianov and Maxim Kozlikin in a chamber of the Denisova cave in Siberia, where the fossil of a 90,000-year-old human hybrid was discovered.
Marmot pups near Crested Butte, Colo. Researchers tracked yellow-bellied marmots’ interactions for 13 years and found that more solitary marmots lived longer lives.
Naomi Oreskes in her office at Harvard University's Science Center. She has been praised by climatologists for communicating climate science to the public.
Caribou from the Dolphin and Union population during a crossing to the Canadian mainland.
The tree pipit migrates to and from Africa and Europe each year.
Lee Se-dol, a professional Go player from South Korea, was smiling amid other players despite losing four of five games against a Google computer program called AlphaGo.
A Spirobranchus worm, commonly called the Christmas tree worm, on a coral reef near Eilat, Israel.
A woman prayed over the bodies of two Asian elephants that were electrocuted in Siliguri, India.
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