Crossing the Gateway together

Virgin Galactic's SpaceShipTwo spacecraft and its mothership WhiteKnightTwo fly over the Golden Gate Bridge on April 6, 2011. (thspaceventure / Flickr)

Virgin Galactic’s SpaceShipTwo spacecraft and its mothership WhiteKnightTwo fly over the Golden Gate Bridge on April 6, 2011. (thspaceventure / Flickr)

Virgin Galactic’s SpaceShipTwo spacecraft and its mothership WhiteKnightTwo fly over the Golden Gate Bridge on April 6, 2011. (thspaceventure / Flickr)credit: Mark Greenberg/Virgin America NO SALES handout photo