Mark June 21 on your calendar: The date’s been set for the launch of what could be the world’s first commercial manned spaceship.

Microsoft cofounder Paul Allen and aviation pioneer Burt Rutan have announced that SpaceShipOne, a craft created by Rutan’s Scaled Composites of Mojave, California, will in a few weeks attempt to reach space from the Mojave Civilian Aerospace Test Center in the California desert.

“This flight is one of the most exciting and challenging activities taking place in the fields of aviation and aerospace today,” says Allen. “Every time SpaceShipOne flies we demonstrate that relatively modest amounts of private funding can significantly increase the boundaries of commercial space technology.”

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