Short answer
The lowest known sound in the universe is a deep B-flat note from the Perseus galaxy cluster, generated by pressure waves from a supermassive black hole. These waves ripple through hot gas, but are trillions of times too low for humans to hear. Space itself does not carry sound like air, but these vibrations act like extremely slow sound waves.
Key points
- The lowest known sound is a B-flat from the Perseus galaxy cluster.
- It is produced by pressure waves from a supermassive black hole.
- The frequency is about one ten-millionth of a billionth of a hertz.
- It takes roughly 10 million years for one wave to pass by.
- These waves affect galaxy formation by heating intergalactic gas.
The lowest known sound in the universe is a B-flat note originating from the Perseus galaxy cluster, over 240 million light-years away. It is not sound as we experience it on Earth, but a ripple in the hot gas between galaxies, caused by a supermassive black hole at the cluster’s center.
How this cosmic sound was discovered
Astronomers detected the waves in 2003 using NASA’s Chandra X-ray Observatory while studying the cluster’s superheated gas. The black hole releases energy in bursts, creating pressure waves that travel through the gas like sound waves in air—though at frequencies far beyond human perception.
Why this sound matters
The waves carry energy outward, preventing the gas from cooling and collapsing into new stars. This process helps regulate star formation across the galaxy cluster. Though space is mostly a vacuum and cannot transmit sound in the usual way, these oscillations behave like extremely low-frequency sound in the dense gas around galaxies.
Frequently asked questions
Can we hear the lowest sound in the universe?
No, the sound from the Perseus cluster is far below the range of human hearing. It would take about 10 million years for one wave to pass, making it trillions of times deeper than the lowest note we can detect.
How can sound exist in space if it’s a vacuum?
Most of space is a vacuum and does not carry sound. But in dense regions like galaxy clusters, hot gas can transmit pressure waves that behave like extremely slow sound waves.
What causes the lowest sound in the universe?
It is caused by a supermassive black hole releasing energy in rhythmic bursts, creating ripples in the surrounding hot gas of the Perseus galaxy cluster.
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