A recent study, published in Physical Review Letters, has revealed that stars can generate sounds. The scientists said that they made this discovery by chance, when they were studying plasma.

The team of scientists was studying hydrodynamics (the motion of fluids) and while analyzing the interaction of an ultra-intense laser with a plasma target, they observed that in the trillionth of a second after the strike of the laser, the plasma flowed quickly from areas of high density to regions of low density, which led to something similar to a traffic jam.

In the laboratory, scientists used a method, resembling a police speed camera, to observe the sound wave. The method enabled the investigators to measure exactly how the fluid was moving at the point where it was struck by the laser in less than a trillionth of a second.

Scientists found that it all happened because of the plasma that gathered at the interface between the low and high density areas and led to the generation of several pressure pulses, a sound wave. They said that the frequency of the sound was so high that that it would have hurt even dolphins and bats.

According to Dr. Alex Robinson, co-author of the study, at first it was very difficult for them to distinguish the origin of the acoustic signals. Still, Dr. Robinson developed a numeric model to produce acoustic waves for the experiment.

The results produced by the model proved compatible with the wavelength shifts that were noticed in the experiment.

Thus, the researchers have found a way with which they can use fluid flows to generate sound. Furthermore, Robinson has explained that the same phenomenon could also occur in the plasma flowing around stars.

Researchers said that stars may look nice and pretty from Earth, but one should not forget that stars are actually gigantic, ultra-hot volatile balls of fire. They make their own beautiful, secret sounds.