Voyager 1 probe leaving solar system reaches ''magnetic highway'' exit
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Other clues that Voyager has reached interstellar space could be the detection of low-energy cosmic rays and a dramatic tapering of the number of solar particles, Stone said. Voyager 1 and a sister spacecraft, Voyager 2, were launched 16 days apart in 1977 for the first flybys of Jupiter, Saturn, Uranus and Neptune.
Voyager 2, traveling on a different path out of the solar system, has experienced similar, though more gradual changes in its environment than Voyager 1. Scientists do not believe Voyager 2, which is about 9 billion miles (14.5 billion km) from Earth, has reached the magnetic highway.