Do you or have you ever use thought experiments to some practical end?

  • TerranFenrir@lemmy.ca
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    5 hours ago

    The answer is very simple. Our universe is very likely not static. We already know that it is expanding (as of today). The further you look in space, the faster that space is moving from us. This causes more and more redshift of light the further you look away (the wavelength of light becomes longer and longer).

    Beyond a certain point, space moves faster than the speed of light. Thus, we get no light.