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...and you're halfway between both, who would get the message first?

For example, let's say the trip is 4 light years long. You reach half the speed of light and you have a laser communication array pointing forward and backward. When you reach the midway point, you send the message to both places. Would they both get the message at the same time or would your destination get it first?

...and you're halfway between both, who would get the message first? For example, let's say the trip is 4 light years long. You reach half the speed of light and you have a laser communication array pointing forward and backward. When you reach the midway point, you send the message to both places. Would they both get the message at the same time or would your destination get it first?

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[–] • 0 pt

If spacetime is dependent on speed and gravity then every location in space has a different speed of time, and a different local ruler. This contradicts the fundamental tenant of science which is that physics is the same everywhere.

[–] [deleted] • 0 pt

Physics is not the same everywhere, that's a canard. There are different rules of physics in, say, the flat near-vacuum of intergalactic space, at the event horizon of a black hole, in the millimeter-deep "atmosphere" of a pulsar, in the quark soup generated by the Large Hadron Collider, and so forth.