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Because light is “it’s own thing” where as sound is an interaction between an atoms.
Think of light as a car. A car can travel pretty fast and sure things light hills and slopes can change how fast it goes but you can’t argue that a car can travel on its own pretty dang fast.
Sound is like a rumor. It requires people to hear it and then tell it someone else, if people are close together rumors can travel quickly, if they are far apart they travel slowly, but *without people there can be no rumors*. Because rumors only exist in being told, they aren’t a thing other than act of by shared between people.
That’s like light and sound in a nutshell. Light is a physical thing all by itself, and it just so turns out that this physical thing can travel insanely quickly. Sound isn’t a thing by itself, it’s an interaction between atoms. If the atoms are super close together it can travel quickly (less distance for the atoms to travel to interact), if they are far apart it travels slowly. But without atoms at all, there is no sound, but sound requires atoms. As a marketer for the Alien franchise once said – No one can hear you scream in space.
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