"Sound waves cannot travel in the vacuum of space because there is no medium to transmit these mechanical waves."
https://science.nasa.gov/ems/02_anatomy
"Beyond gases, there’s another state of matter called plasma. And it makes up 99.9% of the observable universe."
https://www.nasa.gov/mediacast/plasma-plasma-everywhere
"Sound is a wave that is created by vibrating objects and propagated through a medium from one location to another."
https://www.physicsclassroom.com/class/sound/Lesson-1/Sound-is-a-Mechanical-Wave
"The four different types of fundamental waves for sound propagation are commonly seen, air, liquid, solid as well as plasma medium. The wavers of sound can travel and can pass through the transmission of the medium"
https://www.tutorix.com/physics/sound-waves-need-medium-propagation
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