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Launched in 1972 by an Atlas-Centaur rocket, Pioneer 10 was the first spacecraft to travel through the asteroid belt between Mars and Jupiter and sent back the first close-up images of Jupiter a year later. It passed the orbit of Neptune in 1983 and became by some definitions the first man-made object to leave our solar system. On February 17, 1998, Pioneer 10 was over 7.60 billion miles away from Earth. When was the last signal received from the craft?