Space-tourism company Virgin Galactic expects that private astronauts will pay more than $600,000 for a ticket on its new Delta class SpaceShipsSpace-tourism company Virgin Galactic expects that private astronauts will pay more than $600,000 for a ticket on its new Delta class SpaceShips Space-tourism company Virgin Galactic expects that private astronauts will pay more than $600,000 for a ticket on its new Delta class SpaceShips   Read More MarketWatch.com – Top Stories