A model of the planned Dream Chaser mini-shuttle designed by Sierra Nevada Corp. is displayed in March 2014 for a news conference at NASA's Michoud Assembly Facility in New Orleans.
The main control room of the European Space Operation Center in Darmstadt, Germany, is pictured Friday during the controlled descent of the European Space Agency space probe Rosetta onto the surface of Comet 67P/Churyumov-Gerasimenko.
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This emergency alert jolted New Yorkers on Sept. 19 as police sought a suspect in connection with explosions in the New York City metropolitan area. Lacking a photo or a link to one, it raised concerns about racial profiling.
An illustration of Rosetta just before Friday's expected landing on the comet known as 67P/Churyumov-Gerasimenko. The final approach aims to be only at "walking speed," mission specialists say, but that's enough to tip the antenna away from Earth.
The original caption to this 1989 photo read, "Cellular phones are being offered by many car manufacturers as optional equipment for drivers who can't bear to be out of touch, even on the road."
Elon Musk, CEO and CTO of SpaceX, introduces the Dragon V2 spaceship at the company's headquarters in Hawthorne, Calif., in May 2014. Musk predicted during an interview at the Code Conference in Southern California on June 1 that people would be on Mars in 2025.
Jae C. Hong/AP
New technology helps trackers follow consumers' digital imprints — including across devices — through browser settings, battery levels and other details.
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