How did scientist discover that the Sun makes an 18 octave sound when space is a vacuum in which you can not hear sound in?
It is true that we can’t hear the Sun with a microphone. Instead, we see the sound waves because of the effect they have on the Sun. The Sun is full of all sorts of sound waves traveling through the interior. Some of them resonate because they are particular frequencies. These sound waves are actually reflected at the surface, although it isn’t solid. But there is an abrupt change in density, which allows the reflection to happen. The sound waves as they reflect at the surface cause a change in brightness and push up some too. So, with the right sort of instruments (see SOHO/MDI) we can measure the changes in brightness and the velocity changes at the surface. From those measurments, we can work out the sound of the Sun. Check out these web sites for more on MDI and the Sun: http://soi.stanford.edu/ (MDI web site) Go back to TOP.
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