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The Canadian-built arm has been in orbit for 16 years. Engineers attribute recent trouble to wear and tear. The two latching mechanisms, one on each end of the arm, have been used nearly 400 times.
SpaceX founder says the cone-headed spaceship called the Dragon V2 is a huge leap forward in technology.
A SpaceX rocket carrying a Canadian satellite intended to track space weather launched from the California coast Sunday in what was billed as a test flight.
