SpaceX's astronaut-riding Dragon arrives at space station

NASA has yet to decide how long Hurley and Behnken will spend at the space station, somewhere between one and four months. While they're there, the Dragon test pilots will join the one U.S. and two Russian station residents in performing experiments and possibly spacewalks to install fresh station batteries.

In a show-and-tell earlier Sunday, the astronauts gave a quick tour of the Dragon's sparkling clean insides, quite spacious for a capsule. They said the liftoff was pretty bumpy and dynamic, nothing the simulators could have mimicked. The blue sequined dinosaur accompanying them — their young sons' toy, named Tremor — was also in good shape, Behnken assured viewers. Tremor was going to join Earthy, a plush globe delivered to the space station on last year's test flight of a crew-less crew Dragon. Behnken said both toys would return to Earth with them at mission's end.

An old-style capsule splashdown is planned.

After liftoff, Musk told reporters that the capsule's return will be more dangerous in some ways than its launch. Even so, getting the two astronauts safely to orbit and then the space station had everyone breathing huge sighs of relief.

As always, Musk was looking ahead.

"This is hopefully the first step on a journey toward a civilization on Mars," he said Saturday evening.

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