KEY POINTS:
Renowned British theoretical physicist Stephen Hawking, who wrote A Brief History of Time, soon will experience weightlessness.
Hawking, who uses a wheelchair and is almost completely paralyzed by amyotrophic lateral sclerosis, or Lou Gehrig's disease, plans to go on a weightless flight on April 26.
The flight, operated by Zero Gravity Corporation, a Fort Lauderdale, Florida-based space tourism company, will take off and return to a landing strip at the Kennedy Space Centre.