Four civilian astronauts have embarked on a daring space mission. Earlier today, Elon Musk's company SpaceX launched its 'Polaris Dawn' mission from NASA's Kennedy Space Center in Florida. The fourstrong crew is travelling further into outer space than humans have ventured since the Apollo moon landings half a century ago. The crew includes a billionaire tech entrepreneur, who's partfunding the mission. They're due to perform the firstever spacewalk conducted by private citizens.

For more on this, we're joined by space expert Keith Cowing, the Editor of NASAWatch.com.

00:00 SpaceX launches 'Polaris Dawn' mission
00:33 Interview with Keith Cowing

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