Scott Kelly snaps photos of Earth and the galaxy from space – in pictures Read moreWhat’s the psychological and physical effect of literally coming back to Earth? Photograph: Scott Kelly/Nasa via APWhat does the space walk feel like? On one of your previous missions, a cosmonaut became untethered during a space walk. With current technology, to go to the nearest Earth-like planet outside the solar system would take about 80,000 years Scott KellyWhat were the most testing aspects of your first space walk? • Endurance: A Year in Space, a Lifetime of Discovery by Scott Kelly is published by Doubleday (£20).

Source: The Guardian October 29, 2017 09:22 UTC