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An unmanned glider streaks over the Pacific Ocean at 20 times the speed of sound in a video released Thursday by a U.S. defense research agency experimenting with technology that could give the ...

Japan’s HTV-2 Kounotori resupply ship undocked from the International Space Station at 15.45 GMT on March 28, and will burn up in Earth’s atmosphere sometime early Wednesday March 31. Back in January, ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. An artist's illustration of DARPA's Hypersonic Test Vehicle-2 flying at speeds of Mach 20. The ...