Despite an unplanned and disconcerting series of barrel rolls on the way up, FlightTwo and TripOne for SpaceShipOne was a rousing success. Now, if they can repeat the feat within the next ten days, the elusive X Prize is theirs, and the business of space tourism will have reached a watershed moment. (Indeed, Richard Branson has already announced he’ll be leasing SS1 tech to kick off Virgin Galactic.) But first, they might want to figure out what’s causing that roll.