Launched in 1972, Pioneer 10 was the first spacecraft to travel through the asteroid belt between Mars and Jupiter and to make up-close observations of Jupiter, capturing images that were later sent back to Earth. Pioneer 10 passed the orbit of Neptune in 1983 and became by some definitions the first artificial object to leave our solar system. By February 1998, Pioneer 10 was more than 7.5 billion miles away from Earth. When was the last signal received from the craft?

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