NASA astronauts Bob Behnken and Doug Hurley will be the first to fly SpaceX's Crew Dragon spaceship. Here's how they're preparing.

NASA astronauts Bob Behnken and Doug Hurley will be the first to fly SpaceX's Crew Dragon spaceship. Here's how they're preparing.

NASA astronauts Bob Behnken and Doug Hurley will be the first to fly SpaceX's Crew Dragon spaceship. Here's how they're preparing.The Crew Dragon is expected to launch a new era of US spaceflight. NASA will then stop relying on Russia to launch its astronauts.