In 2001, Cramer wrote a column called “BOOMERanG and the Sound of the Big Bang” for the publication Analog Science Fiction and Fact. In the column, he talked about an experiment that had recently recorded the temperature of the cosmic microwave background—the radiation left over from the Big Bang. In the column, he called the data the “sound of the Big Bang.”
In 2003, Cramer got an email from a woman whose 11-year-old was doing a school project on the Big Bang. He had read Cramer’s column, and wanted to know if there was actually a recording of the “sound of the Big Bang” that he could play for his class. There wasn’t, but it got Cramer thinking. “The idea of synthesizing the Big Bang sound fascinated me,” Cramer writes on his website. “It ran around in my head for a day or so, and I had a growing desire to hear just what the Big Bang sounded like.”
So he made it. Using data from a NASA satellite called WMAP, he plugged in the frequency spectrum from the Big Bang into some software to turn the data into a sound file. “When I ran the program for the first time and the sound started in my office, our two male Shetland Sheepdogs, Alex and Lance, came running into the room, barking with agitation,” Cramer writes.” Here’s what it sounds like:
In 2013, Cramer made a new sound file using new data, this time from the European Space Agency’s Planck Mission. Here’s what that one sounds like:
Since before the Big Bang there was no universe, it seems safe to say that this is likely the first sound in the universe. But what was the first sound ever actually heard? To figure that out, we need to figure out which organism was first able to hear.
The first organisms to be able to hear things were probably the bony fishes, which appeared on this planet about 400 million years ago. These fish developed the ability to sense vibrations by adapting an organ they used to balance themselves in the water called the “balance labyrinth.” Eventually, that labyrinth got more and more complicated, developing curves and features that would, a long time later, develop into a proto-cochlea.
So what were these fish hearing? What sounds did these early labyrinth organs pick up? Mostly vibrations that coursed through their bodies as they moved through the water (or, in later cases, as they walked along muddy banks). This system works well when there’s water around, but as animals moved up and out of the water, vibrations in the air didn’t carry as much energy, and couldn’t wiggle the bones quite as much. It wasn’t until the Triassic period that eardrums showed up, which made it much easier for organisms to hear sounds transmitted through the air.
Fast forward a whole lot of time, and we get to humans. The first sound that we recorded as a species was gathered by a device called a phonautograph, invented by a man named Édouard-Léon Scott de Martinville in 1857. Phonautographs transcribe sound waves into a line that is drawn on paper or glass. The first phonoautographic recording that still exists is from 1860, and it’s a French folksong called “Au Clair de la Lune.” You can listen to it here.