"Being on a ventilator has not curbed my lifestyle. Since going on a ventilator full time I have been to Brussels, the Isle of Man, Geneva, Canada, California twice, and I hope to go into space with Richard Branson's Virgin Galactic," he said during a rare public appearance here.
It's been six long years since the Cambridge professor and author of the worldwide bestseller, 'A Brief History of Time', got a taste of weightlessness during a zero-G airplane flight from NASA's Kennedy Space Center, but he still wants to feel the real deal aboard Virgin Galactic's 'SpaceShipTwo' rocket plane. After that flight Hawking declared, "Space, here I come!"
If all the tests go right, SpaceShipTwo could be taking passengers on suborbital space trips as early as next year. Richard Branson, Virgin Galactic's billionaire founder, promised to consider Hawking for one of those trips even before he took his ride into weightlessness in 2007. The invitation still stands, according to George Whitesides, the company's president and CEO.
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The wheelchair-bound scientist, now director of research at Cambridge's Centre for Theoretical Cosmology, revealed he has been on full-time ventilation for last 18 months, using a machine supplied by the UK's National Health Service.
His speech has slowed to just one word a minute, twitching his cheek to stop a cursor moving across text on a screen.
Computer hardware firm - Intel has been developing a device which will allow Hawking to compose his sentences more quickly.
If Hawking were to fly into space sometime in the next few years, he'd would be second on the list of the world's oldest astronauts. The only person older would be senator-astronaut John Glenn, who flew on the space shuttle Discovery at the age of 77 and is now 91 years old.