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Able and Miss Baker became the first monkeys to successfully return to Earth after space traveling. In 1959 NASA launched mission, which goal was to closely monitor life signs, mental state and cabin environment of these monkeys and safely return them to Earth alive.
For many years, NASA has used monkeys to study radiation exposures to animals (and humans). In order to investigate possible missions to Mars, NASA announced new sets of experiments on squirrel monkeys. Monkeys will receive a low dose of radiation.
Gordo or "Old Reliable" was one of the first monkeys sent into the space. He traveled further than any monkey had ever travelled before, but unfortunately was killed because his parachute module failed.
Many monkeys have bravely served their countries. They helped us gain more knowledge about universe. Read about the history of monkeys in space.