earth twin and space twin CAN interact but bc they're at the border of the
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Replying to @arthur_affect @BootlegGirl and
light cone they don't interact v well
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Replying to @arthur_affect @BootlegGirl and
another way to look at the twin paradox is by looking at interaction w light
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Replying to @arthur_affect @BootlegGirl and
say they've got radio waves beaming a constant Skype call
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Replying to @arthur_affect @BootlegGirl and
bc light takes time to travel both sides of the call will be "behind"
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Replying to @arthur_affect @BootlegGirl and
the call will be "slowed down" (indeed the signal redshifted)
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Replying to @arthur_affect @BootlegGirl and
earth twin sees space twin slowed down relative to him, and vice versa
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Replying to @arthur_affect @BootlegGirl and
space twin A cannot call space twin B, the radio waves won't cross his path
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Replying to @arthur_affect @BootlegGirl and
this much ppl get - but from our POV we think of this as an "illusion"
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Replying to @arthur_affect @BootlegGirl and
like the Skype call is years "behind" on both ends but it must be possible
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to "catch up"
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Replying to @arthur_affect @BootlegGirl and
Einstein's insight was since light waves are the only interaction that exists
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Replying to @arthur_affect @BootlegGirl and
there is no illusion, both twins objectively are "behind" each other at once
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