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The Voyager 1 spacecraft is 11 billion miles from the sun. And every minute, it gets 636 miles closer to its destination: the frontier of interstellar space. The craft is currently between what NASA calls "the solar wind from the Sun and the interstellar wind from death-explosions of other stars."
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Though scientists don't think the planets could sustain life, they say their discovery is significant because it shows that we can now detect planets that are roughly the same size as our own.