SpaceX Crew Dragon, built to carry humans, launches demo flight - CNN

An uncrewed demonstration mission took off from Kennedy Space Center in Florida just before 3 am ET.

The successful launch puts SpaceX one step closer to an historic landmark: Crew Dragon could be the first commercially built spacecraft to carry NASA astronauts to orbit. And Crew Dragon — along with a capsule called Starliner built by Boeing — could end the United States' decade-long reliance on Russia for human spaceflight.

SpaceX's capsule is now en route to the International Space Station, which flies about 254 miles above Earth at tremendous speeds: about 10 times faster than a bullet.

Crew Dragon is carrying a dummy named Ripley, named for the "Alien" protagonist, instead of people. And it will dock with the orbiting laboratory on Sunday to drop off about 400 pounds of supplies before it flies back home five days later.

This marks the first and only demo mission that Crew Dragon will fly without humans on board. If all goes well, the capsule design will undergo a few more reviews and safety checks, and it could be ready to fly two NASA astronauts to the space station in July, based on the space agency's current timeline.

After the Space Shuttle program retired in 2011, NASA turned for the first time to the private sector to build the next generation of human spaceflight hardware.

SpaceX and Boeing (BA) have contracts worth up to $2.6 billion and $4.2 billion, respectively.

Both project have been beleaguered with delays, and NASA and its oversight regulators have raised safety concerns that will have to be resolved before humans set foot on either spacecraft.

Meanwhile, NASA has paid Russia about $80 million per seat to send US astronauts to space aboard Soyuz rockets — a fact that isn't very popular in the halls of Congress.

Those Soyuz contracts were set to run out in 2019 and NASA recently moved to secure a couple more seats for late 2019 and the spring of 2020 in case Boeing and SpaceX aren't ready this year.

The space agency said in a statement last month that it has "confidence" the companies will be ready in 2019 and said the additional Soyuz contracts are meant to provide "flexibility and back-up" options.

Why Florida is still dominating the space launch game

The companies can still launch people this year — but things will have to go smoothly.

SpaceX aced a key NASA review ahead of Saturday's launch. If all goes well during the demo mission, the company will conduct a test on Crew Dragon's emergency abort systems in June. More safety checks are also in store.

SpaceX's first crewed mission, which will fly NASA astronauts Doug Hurley and Bob Behnken, could happen by July, according to NASA's most recent schedule.

Boeing's Starliner is slated to fly its first demo mission without a crew no earlier than April.

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