Astronauts ready for historic all-female spacewalk
There have been 420 spacewalks and at least one man has taken part in every one of them. But astronauts Christina Koch and Jessica Meir are about to change history. Mark Strassmann explains.
There have been 420 spacewalks and at least one man has taken part in every one of them. But astronauts Christina Koch and Jessica Meir are about to change history. Mark Strassmann explains.
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