https://www.livescience.com/voyager-hum-interstellar-space.html

ByStephanie Pappas-Live Science Contributorabout 4 hours ago

Interstellar plasma is vibrating out there past the edges of the solar system.

An illustration of the Voyager 1 spacecraft, which is traveling through interstellar space.(Image credit: NASA/JPL)

Forty-four years after it rocketed off from Earth, the Voyager 1 spacecraft is detecting the background “hum” of interstellar space for the first time.

Voyager 1, launched in 1977, left the bounds of thesolar system— known as the heliosphere — in 2012. The heliosphere is the bubble of space influenced by solar wind, the stream of charged particles that emanates from the sun. Since popping out of this bubble, Voyager 1 has been periodically sending back measurements of the interstellar medium. Occasionally, the sun sends off a burst of energy known as a coronal mass ejection that disturbs this medium, causing the plasma, or ionized gas, of interstellar space to…