The United Launch Alliance Atlas V rocket and Orbital ATK Cygnus spacecraft stack sits on the launch pad at Cape Canaveral Air Force Station in Cape Canaveral, Fla., Monday, March 21, 2016. The cargo carrier is scheduled to launch Tuesday, March 22, and holds a commercial-quality 3D printer for astronaut as well as public use, for a price. (Photo by Ben Smegelsky/NASA via AP Photo)
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