What does  Sun sound like? Perhaps you have never thought about what kinds of sounds  Sun makes, but scientists have found out. Researchers from  European Space Agency, NASA and the Solar and Heliospheric Agency studied 20 years of data to listen to  Sun. They say the Sun produces  low, deep "heartbeat" sound. The scientists used  solar observatory to measure vibrations from  Sun. They translated these vibrations into different sounds. These can tell  scientists what is happening inside  Sun. They can now understand more about solar flares, chemical reactions and other phenomena that happen inside  Sun and on its surface. 
 scientists explained how they created  Sun's sound. Researchers from  Stanford Experimental Physics Lab turned data from the space agencies into  "song". Dr Alex Young said: "We don't have straightforward ways to look inside  Sun. We don't have  microscope to zoom inside the Sun, so using  star or the Sun's vibrations allows us to see inside of it." Dr Young continued: "Waves are travelling and bouncing around inside the Sun, and if your eyes were sensitive enough, they could actually see this."  He added: "We are finally starting to understand  layers of the Sun and the complexity. That simple sound is giving us  probe inside a star. I think that's  pretty cool thing."