China’s classified Shijian-31 satellite, launched on June 16 aboard a Long March 3B from Xichang, is operating in an unusual Molniya-type orbit that appears designed to give it repeated, wide-ranging
Titan, Saturn’s largest moon, is the only place besides Earth known to have stable liquid on its surface, but its landscape is shaped by a very different substance: liquid methane and ethane instead o
Mount Everest is the highest point on Earth above sea level, with an official height of 8,848.86 metres, but it is not the point farthest from the planet’s centre. That distinction belongs to Chimbora