In the science-fiction TV series Star Trek: The Next Generation, a replicator creates food and water during space voyages in the 24th century. Occasionally, replicators even created spare parts, enabling the crew to repair damaged parts onboard the USS Enterprise. This futuristic technology was the concept behind National Geographic Channel's recent episode of Known Universe. The segment explored a technology, available today, that could allow astronauts to replicate tools damaged or lost in space.
