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On August 20, 1977, NASA's Voyager 2 spacecraft began its journey to the planets of our solar system.
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When it flew past Jupiter and Saturn,
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it gained momentum to reach even the farthest planet - Neptune - twelve years after takeoff.
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But Voyager's particle detectors also give information about the solar system beyond the planets.
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They measure the current of electrically charged particles: the solar wind.
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The sun constantly throws about a million tons of particles a second into space.
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The particles spread far beyond the planetary system.
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Their range describes the so-called heliosphere.
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Voyager should determine their size.
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At the end of 2018,
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more than 40 years after launch, Voyager’s signals show a radical drop in solar wind particles.
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Nearly 17 billion kilometers away from the Sun, Voyager 2 leaves the heliosphere and enters interstellar space.
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Along with voyager 1, the probe carries one of the two famous "golden disks"
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that contain sounds, voices and images from Earth.
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The record also includes a short sentence in Esperanto
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spoken by Australian diplomat Ralph Lindsay Harry:
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"We strive to live in peace with the peoples of the whole world, of the whole cosmos."
