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SpaceX's new crew capsule arrived at the International Space Station on Sunday, acing its second milestone in just over a day.

No one was aboard the Dragon capsule launched Saturday on its first test flight, only an instrumented dummy. But that quickly changed once the hatch swung open and the space station astronauts floated inside.

The crew Dragon is the first American-made, designed-for-crew spacecraft to pull up to the station in eight years. The three station astronauts had front-row seats as the sleek, white capsule neatly docked, a little early no less. TV cameras on Dragon as well as the station provided stunning views of one another throughout the rendezvous.

Just two hours after the Dragon's grand entrance, the station crew entered to take air samples. The astronauts wore oxygen masks and hoods until getting the all-clear.

If the six-day demo goes well, SpaceX could launch two astronauts this summer under NASA's commercial crew program. Both astronauts — Doug Hurley and Bob Behnken — were at SpaceX Mission Control in Southern California, observing all the action. They rushed there from Florida after watching the Dragon rocket into orbit early Saturday from NASA's Kennedy Space Center.

"Just super excited to see it," Behnken said minutes after the link-up. "Just one more milestone that gets us ready for our flight coming up here."

While SpaceX has sent plenty of cargo Dragons to the space station, crew Dragon is a different beast. It docked autonomously under the station astronauts' watchful eyes, instead of relying on the station's robot arm for berthing. The capsule's nose cap was wide open like a dragon's mouth, to expose the docking mechanism.

Behnken said that's the way it should work when he and Hurley are on board; they may push a button or two and will have the ability to intervene, if necessary.

As part of Sunday's shakedown, the station astronauts sent commands for the Dragon to retreat and then move forward again, before the capsule closed in for good.

SpaceX employees at company headquarters in Hawthorne, California, cheered and applauded as crew Dragon pulled up and docked at the orbiting lab, nearly 260 miles above the Pacific, north of New Zealand. They burst into applause again, several minutes later, when the Dragon's latches were tightly secured.

The capsule's lone passenger for launch — a mannequin wearing a white SpaceX spacesuit — remained strapped into its seat as the station's U.S., Canadian and Russian crew removed supplies. The test dummy — or Smarty as SpaceX likes to call it, given all the instrumentation — is named Ripley after the lead character in the science-fiction "Alien" films.

Dragon will remain at the space station until Friday, when it undocks and aims for a splashdown in the Atlantic, a couple hundred miles off the Florida coast.

Like Ripley, the capsule is rigged with sensors to measure noise, vibration and stresses, and to monitor the life-support, propulsion and other critical systems throughout the flight.

SpaceX aims to launch Behnken and Hurley as early as July.

Next up, though, should be Boeing, NASA's other commercial crew provider. Boeing is looking to launch its Starliner capsule without a crew as early as April and with a crew possibly in August.

NASA is paying the two private companies $8 billion to build and operate the capsules for ferrying astronauts to and from the space station. Astronauts have been stuck riding Russian rockets ever since NASA's space shuttle program ended in 2011. Russian Soyuz seats go for up to $82 million apiece.

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SpaceX's new crew capsule arrived at the International Space Station on Sunday, acing its second milestone in just over a day.


SpaceX's new crew capsule aces space station test

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