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This is Scientific American's 60-Second Space. I'm John Matson. Got a minute?

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This time it's really gone.

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Previous claims have been made, but NASA says that after a 35-year journey Voyager 1 has indeed reached interstellar space.

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And here's the evidence:

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(SOUND)

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I'll tell you what that sound is in a moment.

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It appears that the spacecraft left the sun's heliosphere more than a year ago.

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In August 2012, Voyager registered a drop in charged particles emanating from the sun.

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At the same time it was hit with higher levels of interstellar cosmic rays.

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But in the absence of corroborating evidence from plasma or magnetic field measurements, Voyager scientists were not convinced that Voyager 1 had truly departed.

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But in March 2012, the sun belched a big batch of plasma.

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The reverberation from that eruption took a year to reach Voyager.

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From the vibration of plasma in Voyager's vicinity, scientists were able to measure the density of the plasma.

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That's what you heard earlier: Voyager's record of seven months of plasma vibrations condensed to a few seconds.

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And that data enabled NASA to conclude that the spacecraft's environs indeed now appear to be the stuff between the stars.

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Cold, dark and very far away.

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Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.

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