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Mysterious ‘hum’ shakes the interstellar space Voyager 1 is recorded.



Forty-four years after it took off from Earth, Voyager 1 was detecting interstellar space “wailing” for the first time.

Voyager 1 was launched in 1977, out of the scope of solar system – Known as the Heliosphere – In 2012, the heliosphere is a space bubble influenced by the solar wind, a stream of electrically charged particles emanating from the sun. Since emerging from the bubble, Voyager 1 has periodically sent back measurements of interstellar medium. From time to time, the Sun sends out an energy called corona-mass ejection that disrupts this medium, shaking the plasma or ionized gas of the interstellar space. These vibrations are very useful as they allow astronomers to measure the density of the plasma.The frequency of the waves through the plasma can show how close the ionized gas molecules are.


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