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Copyright 2016 NPR. To see more, visit http://www.npr.org/.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

A massive space shuttle fuel tank is winding its way through the streets of Los Angeles Saturday, on a 16-mile trek heading to the California Science Center.

It's set to be displayed with the space shuttle Endeavor. The tank, which was never used in a mission, is the "last flight-qualified space shuttle external tank in existence," according to the science center.

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