Who would think that a star so peaceful and quiet in the sky could ever produce a sound?
Unexpectedly, scientists found that they could actually create a sound that no human could ever hear.
A group of scientist of the University of York in their study examined the interaction of a powerful laser with a plasma target when they were surprised at what they have witnessed. The group found that in the trillionth of a second after the laser hits, plasma gushed quickly from areas of high density to more slow-moving areas of low density to such a degree that it produced some sort of a blockage. Plasma accumulated at the compound between the high and low density sections which triggers a chain of pressure pulses which creates a sound wave.
The sound though was not perceptible by any mammal or humans since it was produced at such a high frequency not even bats and dolphins that possesses echolocation skills could even hear. The thing is , at almost a trillion hertz it was close to the highest frequency possible in such a material.
“One of the few locations in nature where we believe this effect would occur is at the surface of stars,” Dr. John Pasley, who was among the researchers stated in a news release.
“When they are accumulating new material stars could generate sound in a very similar manner to that which we observed in the laboratory – so the stars might be singing – but, since sound cannot propagate through the vacuum of space, no one can hear them.”
The question lies on how was it known that it could actually make a sound. The scientist were able to prove their findings through detecting the sound in the lab by using a method that was the same as how a police camera would work . It gives them the opportunity to accurately measure how fluid is moving at the point it is hit by the laser on timescales of less than a trillionth of a second.
“It was initially hard to determine the origin of the acoustic signals, but our model produced results that compared favorably with the wavelength shifts observed in the experiment. This showed that we had discovered a new way of generating sound from fluid flows,” said Alex Robinson, who was involved in the study. “Similar situations could occur in plasma flowing around stars.”