This Is What the Birth of the Universe Sounded Like | Mark Whittle | TED
TED
Sound Waves from the Infant Universe 0:04
Looking far enough into space means looking far back in time, all the way to a moment when the universe was only 400,000 years old, glowing hot and uniform. Light from that era stretched as space expanded, arriving today as the cosmic microwave background. Sensitive telescopes revealed faint patches of brighter and darker regions in that background, and these patches turn out to be the peaks and troughs of enormous sound waves moving through the early gas.
How Gravity Made These Sounds 3:00
The sound was not the bang of the Big Bang itself. It came from gravity slowly acting on slightly uneven matter, pulling gas into denser regions, compressing it, then letting it bounce back out, over and over, like organ pipes of different sizes producing a range of pitches. The measured sound reaches 90 decibels, as loud as a rock concert, but sits 50 octaves below what human ears can hear, with a single wave taking 50,000 years to pass. When shifted up 50 octaves and compressed into 10 seconds, the sound resembles noise more than music, and its pitch drops over time as larger regions begin to vibrate.
Traces in Today's Galaxies 7:03
When the universe turned transparent at 400,000 years, these sound waves froze in place and later shaped how matter collapsed into stars and galaxies. Mapping 100,000 galaxies today still shows faint traces of that same fundamental tone and its harmonics, meaning the pattern of galaxies is essentially a fossilized sound wave. The ultimate source traces back to quantum vibrations smaller than atoms, amplified during a burst of hyperexpansion called inflation, linking the quantum world directly to the cosmic one. Artists later turned the shifting pitches into musical notes, and a choir and organ piece based on them was performed in a cathedral, a moment that felt like science and art meeting inside a sacred setting, since the atoms that once vibrated in that early gas now sit inside human brains, letting the universe witness itself.
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