While the crew of Apollo 9 was still orbiting Earth on this day in 1969, preparations were already underway on the ground for the next critical step in the race to the Moon.
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Watch Northrop Grumman's 1st 'Cygnus XL' cargo spacecraft leave the space station on March 12
Northrop Grumman's first "Cygnus XL" cargo ship will depart the International Space Station Thursday morning (March 12), and you can watch the action live.
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