Astrophysicist Stephen Hawking experienced weightlessness on a special zero gravity flight. Hawking took the flight as the first step to taking a seat on one of the first suborbital flights that private companies are likely to offer by 2010. Similar to ITV Evening News - ALSO INCLUDES Different shots of Stephen Hawking (Physicist) speaking in Orlando, Florida - REUTERS; Hawking experiencing weightlessness (floating) on a flight from the Kennedy Space Center - US POOL