SpaceShipTwo glide flight
VSS Unity, Virgin Galactic's second SpaceShipTwo, glides during a Dec. 22 flight test.

Virgin Galactic’s second SpaceShipTwo suborbital spaceplane performed its second free flight Dec. 22 as the company prepares to enter a critical year in the vehicle’s long-delayed development.

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Jeff Foust has more than a decade of experience writing about space policy, entrepreneurial ventures and regulatory affairs. In 2001, he established spacetoday.net to aggregate and summarize the day's space-related news stories. In 2003, he started The...