What Apollo 11 pilot Michael Collins feared most during critical NASA mission 

This week marks the 50th anniversary of the Apollo 11 mission, which first landed American astronauts on the moon's surface. Of the intrepid crew, Neil Armstrong and Buzz Aldrin have tended to dominate public attention, but it was pilot Michael Collins who flew the command module to the moon -- and faced his own distinct concerns about the return trip. Science correspondent Miles O’Brien reports.
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