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1 .This is Scientific American's 60-Second Space. I'm John Matson. Got a minute?
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2 .This time it's really gone.
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3 .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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4 .And here's the evidence:
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5 .(SOUND)
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6 .I'll tell you what that sound is in a moment.
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7 .It appears that the spacecraft left the sun's heliosphere more than a year ago.
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8 .In August 2012, Voyager registered a drop in charged particles emanating from the sun.
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9 .At the same time it was hit with higher levels of interstellar cosmic rays.
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10 .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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11 .But in March 2012, the sun belched a big batch of plasma.
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12 .The reverberation from that eruption took a year to reach Voyager.
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13 .From the vibration of plasma in Voyager's vicinity, scientists were able to measure the density of the plasma.
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14 .That's what you heard earlier: Voyager's record of seven months of plasma vibrations condensed to a few seconds.
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15 .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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16 .Cold, dark and very far away.
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17 .Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.
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