Jack asked BBC Weatherman Alex Deakin, 'If hot air rises, why is space so cold?' Read Alex's answer here: http://www.thebigbangfair.co.uk/nsec/viewitem.cfm?cit_id=385506
Dominic, 16, asked sailor Dame Ellen MacArthur, "If you were to sail around the world again, would today’s technology make it easier?" http://goo.gl/eaC8b
Great picture of science in action!
Dallas Campbell has been answering your questions for Ask the Experts - watch his answers here!
Watch an interview with Andrew shortly after he discovered he was the new UK Young Engineer of the Year.