Outer space is essentially silent. Sound travels as pressure waves through a medium like air or water, and the near-perfect vacuum of space has far too few molecules to carry those vibrations. But that doesn’t mean space has nothing to offer your ears. Scientists have found creative ways to translate the real physical phenomena of space into audible sound, and in a few cases, actual audio recordings exist from the surfaces of other worlds.
Why Space Itself Is Silent
Sound needs something to push against. On Earth, when you speak or clap, you create pressure waves that compress and expand the air molecules around you, rippling outward until they reach someone’s eardrum. In space, the density of particles is so low that these pressure waves simply can’t form or propagate. No medium, no sound. This is a hard physical limit, not a matter of volume or distance.
That said, space isn’t completely empty everywhere. Dense clouds of gas, the atmospheres of planets, and the superheated plasma inside galaxy clusters all contain enough material to carry pressure waves. The catch is that these waves typically vibrate at frequencies far too low or too high for human ears to detect. Our hearing covers roughly 20 to 20,000 vibrations per second. The “sounds” rippling through a galaxy cluster might vibrate once every few million years.
How NASA Turns Space Data Into Sound
The technique behind most “sounds of space” you’ll find online is called data sonification. Scientists take the same digital data used to create space images and map it onto audio properties instead. Brightness in an image might become volume. Position might become pitch. Color might correspond to different instruments or tones. The result isn’t a recording of something you’d hear if you floated nearby. It’s a translation, turning real measurements of light, radio waves, or particle density into something your brain can process through your ears rather than your eyes.
This isn’t just for public entertainment. Sonification helps researchers notice patterns in data that might be invisible in a chart or photograph, like subtle rhythms in a star’s pulsation or density changes in plasma flowing between galaxies.
The Black Hole That Actually Creates Sound Waves
The black hole at the center of the Perseus galaxy cluster is one of the most striking examples of real sound in space. Since 2003, astronomers have known that this black hole sends out pressure waves that ripple through the surrounding cloud of superheated gas. That gas is dense enough to carry actual sound waves, making this one of the rare places in space where acoustic vibrations genuinely exist.
The note it produces sits about 57 octaves below middle C, a frequency so absurdly low that no living creature could perceive it. To put that in perspective, scientists had to raise the pitch by 57 to 58 octaves, multiplying the original frequency by 144 quadrillion to 288 quadrillion times, just to bring it into the range of human hearing. The resulting audio is a deep, eerie rumble that sounds almost like a slow exhalation.
What the Sun Sounds Like
The Sun constantly vibrates. Its surface rises and falls in complex oscillation patterns driven by pressure waves churning through its interior, and data from the Solar and Heliospheric Observatory (SOHO) has captured these dynamic movements for over two decades. Researchers at the Stanford Experimental Physics Lab processed 40 days of this vibration data by filtering it to isolate clean wave patterns around 3 millihertz, then sped the data up by a factor of 42,000 to shift it into the audible range.
The result is a low, droning hum with subtle variation, almost like a deep bell that never quite stops ringing. These oscillations give scientists a way to study the Sun’s internal structure, much like seismologists use earthquake waves to map Earth’s interior.
Jupiter’s Radio Roar
Jupiter produces powerful radio emissions that NASA’s Juno spacecraft picks up with its Waves instrument. These signals originate from electrons streaming along Jupiter’s enormous magnetic field lines, many of them flung into space by the volcanic eruptions of its moon Io. As these electrons rain down toward Jupiter, they generate what scientists call decametric radio emissions.
When converted to audio, Jupiter’s radio emissions sound like a chaotic, crackling roar, something between static and alien whale song. Juno detects these signals whenever its orbit crosses into the cone-shaped beam pattern of the emissions, giving researchers precise location data about where in Jupiter’s magnetic field the radio waves originate.
Actual Audio From Other Planets
Two worlds in our solar system have yielded genuine sound recordings, captured by microphones sitting in real atmospheres.
The Soviet Venera 13 lander made history on March 1, 1982, when it touched down on Venus and captured the first audio recording ever made on another planet’s surface. Microphones on the probe recorded atmospheric wind noises along with mechanical sounds from the lander’s own equipment. The probe was designed to survive Venus’s crushing pressure and extreme heat for about 32 minutes but kept operating for at least 127 minutes. The recording is faint and noisy, but it represents wind blowing across an alien landscape at roughly 900°F.
Mars offers a more detailed acoustic portrait. NASA’s Perseverance rover carries microphones that have recorded Martian wind, the buzzing of the rover’s own laser, and even the whir of the Ingenuity helicopter’s blades. Sound on Mars behaves strangely compared to Earth. Low-pitched sounds travel at about 240 meters per second, while higher-pitched sounds move slightly faster at 250 meters per second. This split, caused by Mars’s thin, cold carbon dioxide atmosphere, means that if you listened to music on Mars, the bass and treble would arrive at slightly different times.
Mars is also remarkably quiet in terms of range. On Earth, a sound might carry about 65 meters before dropping off. On Mars, it fades at just 8 meters, and high-pitched tones disappear entirely at that distance. Standing on Mars, you’d experience an oddly muffled world where even nearby sounds seem dampened.
The Hum Between the Stars
Voyager 1 crossed into interstellar space in 2012, becoming the first human-made object to leave the Sun’s protective bubble. Its Plasma Wave System has been listening to the space between stars ever since, and starting in 2017, it detected a faint, persistent, narrowband plasma wave emission. This steady signal represents the “hum” of interstellar space: the background vibration of ionized gas drifting between star systems.
Earlier measurements of interstellar plasma density relied on occasional bursts triggered by shockwaves from the Sun. This new persistent signal, published in Nature Astronomy, allows continuous sampling of the plasma density over distances of about 10 astronomical units, revealing small-scale density fluctuations that trace turbulence in the interstellar medium. When converted to audio, it sounds like a steady, quiet tone, almost like the background hiss of a universe that’s never truly still.
What Astronauts Actually Hear
Inside a pressurized spacecraft, there’s plenty of air to carry sound, and the International Space Station is far from quiet. Fans, pumps, life support systems, and scientific equipment create a constant background noise environment that NASA actively monitors because of its health implications. Prolonged exposure to this noise can cause irritation, headaches, and degraded sleep. It can also lead to temporary or permanent hearing loss, sometimes without crew members even realizing the damage, because they become desensitized to the elevated levels over time.
NASA runs the Acoustic Diagnostics investigation, which tests ISS crew members’ hearing before, during, and after their missions to track these effects. The combination of noise exposure and the microgravity environment creates acoustic conditions unlike anything on Earth, where the constant mechanical hum of a space station is the actual soundtrack of human spaceflight.