I’ve read that there’s no limit on how close to the speed of light you can travel, and by doing so, photons will blueshift to infinity. So eventually you would be traveling so fast, that photons would have a wavelength of 1 Planck length. What happens if you speed up more? Can wavelength go below the Planck length, or would something else happen?
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Things would get weird
How weird and what exactly would happen? We’ve got no idea though it’d almost certainly split into an electron and positron longgg before it got to Planck length
That’s really what the Planck units tell you. They’re not the smallest possible unit, they’re just smaller than our physics can handle. Any interactions at that scale would be dominated by quantum gravity but we don’t have a good model for quantum soo it’s not really predictable
Things actually get weird well before the Planck length, that’s more a “here there *definitely* be dragons” level than a hard threshold
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