NASA's space shuttle Endeavour appears to hang off one end of the International Space Station in this photo taken by an astronaut aboard a nearby Soyuz spacecraft on May 2011 during Endeavour's final mission. It is one of the first-ever images of a sp
This is a volcano, but not as we know it. This cerulean eruption takes place in the Danakil Depression, a low-lying plain in Ethiopia. The volcano's lava is the usual orange-red – the blue comes from flames produced when escaping sulphuric gases burn.