One of the most important features of extrasolar planets is whether they have an atmosphere or not. For astrobiology in particular, small, rocky planets blanketed with an atmosphere offer the best hop

A mosaic image of Enceladus created from data ...

Earth exists in a bubble. Our atmosphere forms a protective barrier between everything on the planet’s surface and the near-empty vastness of space. But it’s not the only bubble Earth sits inside. Bey

While our planet only has one easily visible Moon, several other tiny objects arguably deserve the title too

On 2 November 2000, a US astronaut and two Russian cosmonauts became the first full-time crew of the International Space Station (ISS). Expedition 1’s Bill Shepherd, Sergei Krikalev and Yuri Gidzenko

Who hasn’t watched a show like Gladiators or Total Wipeout and thought: “Yeah, I could do that”? Or even: “I bet I could do better”? In my case, that thought also extended to – wait for it – astronaut