World-Changing Ideas Summit 2014: Jeffrey Hoffman

Can we ever live on other planets? Former astronaut Jeffrey Hoffman speaks to BBC’s Laura Trevelyan about why humanity’s future may depend on living on other worlds.

Jeffrey Hoffman, a retired astronaut who spent more than 50 days in orbit on Nasa missions, talks to the BBC’s Laura Trevelyan about the challenges facing space colonists at BBC Future’s World-Changing Ideas Summit in New York on 21 October.

Discover more ideas from the World-Changing Ideas Summit

If you would like to comment on this, or anything else you have seen on Future, head over to our Facebook or Google+ page, or message us on Twitter.