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 Originally Posted by a500lbgorilla
MMM'll answer it better. But yes, all space everywhere is expanding. Even the space between you and you.
It's better to talk about how this is known, not what is known. Hubble figured this out. He looked at stars everywhere and realized there was such a thing as a standard star - called a standard candle. They all burned basically the same - size, light, rate, heat, pretty much alike. Well, he knew that just like a fire-engines siren shifts its pitch depending on if it's approaching you or moving away, so does the light of these standard candles. So he set about to figure out how the universe was moving around us.
And what he discovered was that everyone was moving away, everyone was red-shifted, everyone was sounding that lower pitch of a siren fleeing away. And not only that, those that were further away, we're even lower pitched than those closer. Without fail, the farther away a star was, the faster it was going away - what could explain that?
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