VIDEO: NTSB news conference on start of SpaceShipTwo investigation

NASA says it is interested in flying astronauts and scientists on commercial suborbital vehicles, like those being tested by Virgin Galactic and Blue Origin, to provide additional training and research opportunities augmenting missions to the orbiting International Space Station.

Last year’s fatal crash of Virgin Galactic’s suborbital rocket plane has delayed the start of the company’s commercial operations at least a year, prompting a change in mindset from a “period of euphoria to a period of real, measurable, but tough progress” as the enterprise backed by Richard Branson enters the second decade since its founding.

These images captured by photographer Gene Blevins show Virgin Galactic’s second SpaceShipTwo space plane making its first rocket-powered test flight Thursday over California’s Mojave Desert, then gliding back to a runway landing.