Ashton Kutcher is the 500th customer to sign up for a flight with Richard Branson’s commercial space fleet. Branson announced the news yesterday on his blog, writing, “I gave Ashton a quick call to congratulate and welcome him. He is as thrilled as we are at the prospect of being among the first to cross the final frontier (and back!) with us and to experience the magic of space for himself.” Tickets for the suborbital flight — which takes customers 68 miles above the Earth, allowing them to experience zero gravity, are $200,000 each. Branson’s Virgin Galactic flights will begin launching in 2013 or 2014, from his base in the New Mexican desert.