SpaceX Polaris Dawn spacewalk: Why it was a historic milestoneSpaceX Polaris Dawn spacewalk: Why it was a historic milestone 

SpaceX Polaris Dawn spacewalk: Why it was a historic milestoneSpaceX Polaris Dawn spacewalk: Why it was a historic milestone 
The SpaceX Polaris Dawn mission may wind down this weekend. Here are all the ways its crew of four citizen astronauts has made history so far.

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