China sent all of its operational aircraft carriers to sea, while a U.S. "flattop" remained in the Philippine Sea.

Moon and other celestial bodies planned by the United States, China, Japan, and the European Space Agency (ESA). These ...

A spacecraft has beamed back some of the best close-up photos yet of Mercury’s north pole. The European and Japanese robotic explorer swooped as close as 183 miles above Mercury’s night side before ...