William Shatner -- Captain James T. Kirk of the U.S.S. Enterprise, to some -- has turned down a flight into space aboard Sir Richard Branson's Virgin Galactic spaceship . Why, you ask? Well... in part because he's scared of flying.

Watch out for those gremlins, Bill!

According to MSN , the former Star Trek actor was invited to join the space mission in 2011 and refused to go. But it was more than just his fear of being up in the air; Shatner claimed that he mainly turned down the offer because Branson wanted him to foot the bill.Explained the actor, "He wanted me to go up and pay for it and I said, 'Hey, you pay me and I'll go. I'll risk my life for a large sum of money'. But he didn't pick me up on my offer."Hey, we get it. Space travel breaks bank. Of course, that hasn't stopped other famous people from making the launch. Right now, confirmed celebrity passengers include Ashton Kutcher, Mila Kunis, Justin Bieber, Leonardo DiCaprio, Russell Brand and British rock band Muse.

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