The idea of weapons in space, once a plot of science fiction, became a reality Monday (Sept. 14), when U.S. Air Force Secretary Troy Meink revealed at the Air, Space and Cyber Conference in Maryland that the United States had deployed "on-orbit space control weapons capable of defending the Joint Force against hostile adversary action."

Experts are worried that with this new announcement, outer space may become the next frontier for an arms race. The 1967 Outer Space Treaty, signed by both the U.S. and the Soviet Union, dictated that no weapons should be placed in orbit. But the treaty had no enforcement mechanism, meaning the U.S.' announcement may not result in any international sanctions, which could instead encourage other countries to add their own weapons to the final frontier, experts suggested.