Images: Soon-to-be bustling space hubs?

Virgin Galactic is building five models of SpaceShipTwo, a larger version of Burt Rutan's SpaceShipOne.

In 2004, SpaceShipOne won the $10 million Ansari X prize offered to the first private organization to launch a reusable, manned spacecraft into space twice within two weeks.

Here, SpaceShipOne makes a test landing at the Mojave Spaceport in September 2004.

Photo by Mojave Aerospace Ventures