From mesmerising views of the Northern Lights to Earth’s glowing cities at night: Astronaut Don Pettit reveals the very best of his stunning space snaps Dr Don Pettit is one of a select few humans to have ever lived, worked, and even walked, in space. The chemical engineer and Nasa astronaut has spent 370 days aboard the International Space Station, taking hundreds of thousands of photos during three separate stays on the orbiting spacecraft between 2000 and 2012.