A Difference Between Light and Sound

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Posted on May 04, 2017 3:52 PM in Elsewhere

I found this distinction between light waves and sound waves very interesting:

As a wave, light was thought to require a medium through which to propagate its energy, much as sound requires air or some other substance to transmit its waves. But light turns out to be quite happy traveling through the vacuum of space, devoid of any medium to carry it. Unlike sound waves, which consist of air vibrations, light waves were found to be self-propagating packets of energy requiring no assistance at all.

It comes from an equally interesting article by Neil deGrasse Tyson on why dark matter matters.

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