Space aviation question... We currently travel to space on rockets pointed upwards. During testing of new technology I'll see news of fixed wing spacefaring aircraft launching from other planes at 30, 40 thousand feet up. 2 questions... 1. How much additional fuel and weight would be needed in order for a rocket/rocketship to take off like a Concorde type ship? 2. What are the next big technologies for space tourism? Is it the rockets? The fuel? The rocket/ship design?