Sound needs a medium to travel, something to bounce off, and since space is known as an empty vacuum, we shouldn’t be able to hear anything, right? Sound does exist in the form of electromagnetic vibrations that pulsate in similar wavelengths, according to NASA.
In the quest to determine whether space is an empty, soundless vacuum, NASA designed special instruments that could record these electromagnetic vibrations, and transferred them into sounds our ears could hear. The result is astonishing.
“Through specially designed instruments, the NASA Voyager, INJUN 1, ISEE 1, and HAWKEYE space probes used plasma wave antenna to record the vibrations all within the range of human hearing (20-20,000 Hz).
“The recorded sounds are the complex interactions of charged electromagnetic particles from the Solar Wind, ionisphere, and planetary magnetosphere.
“The recordings include, Saturn’s rings, Miranda, Neptune, Voice of Earth, Saturn, Jupiter, IO, Rings of Uranus, Song of Earth, and Uranus.”
“Strictly speaking, the plasma wave instrument does not detect sound. Instead, it senses waves of electrons in the ionized gas or ‘plasma’ that Voyager travels through. These waves, however, do take place at frequencies that humans can detect.”
“We can play the data through a loudspeaker and listen. The pitch and frequency tell us about the density of gas surrounding the spacecraft.”