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Raflesia t1_j27izsh wrote

They would be moving away at the speed of light from any reference point. One neutrino would "see" the other moving away at the speed of light.

If you stood between them they would both be moving away at the speed of light from you. If you shot one away and then accelerated to the speed of light in the other direction then that neutrino would still be moving away at the speed of light.

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acrabb3 t1_j28jcvn wrote

How would the neutrinos perceive each other's (and their own) velocity relative to the start point?
The most cohesive answerer I can think of is that they would see the other neutrino as still at the start point, and therefore everything at the start would appear to be frozen in time.
Which makes sense, since no new information could catch up with them without going faster than light

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Raflesia t1_j29lvb8 wrote

Yup, you got it.

My previous answer is technically incorrect in the sense that "objects" at light speed don't really experience time anymore, but people have a tendency to ignore that bit when trying to explain relativity in hypothetical examples.

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