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The Boston Globe

Nation

Spacecraft enters an unknown realm

Voyager 1 is on track to leave the solar system

LOS ANGELES — The unstoppable Voyager 1 spacecraft has sailed into a new realm of the solar system that scientists did not know existed.

Voyager 1 and its twin, Voyager 2, have been speeding away from the sun toward interstellar space, or the space between stars.

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