Astronaut McCandleless, in this picture is floating free in space guided by a manned manuevering unit(MMU). Astronauts McCandleless and Robert Stewart were the first to experience a nontethered free float in space. This is the farthest out any astronaut in history has ever gone. MMU has been put to use by deploying space probes and satelites. They work by shooting jets of nitrogen. Compared to the amount of weight on earth these jet packs are virtually weightless in outer space. there have been many upgrades to this jetpack that make them easier to use.
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