# What happens to the timing of entangled particles with the Andromeda Paradox?

Two entangled particles. Particle A is in the pocket of a man who is 10 billion light years away from Earth, and he walking away from Earth (so according to Lorentz transformation in his time it is 150 years into the past on earth). He measures the particle spin. Would we have seen the entangled particle on earth with the same spin 150 years ago? Is it that simple? And if we had seen that particle 150 years ago, we could predict the spin of the far away particle.

• Suppose I have two marbles, one blue, one red. I choose one at random and, without looking, give it to my friend, who promptly flies to another continent (or, if you like, to the Andromeda Galaxy). By looking at the marble I have, I can instantly predict which marble my friend has, no matter how far away he is. No quantum weirdness involved at all, they're just ordinary marbles. Where's the paradox? Jan 5, 2020 at 23:18
• Essentially, you can't just declare that two entangled particles exist. How was the entanglement created, and how did Particle A subsequently get into the faraway man's pocket? Jan 5, 2020 at 23:20
• @probably_someone this is a question about timing of simultaneous events. Can two simultaneous events occur 150 years apart because of Lorentz transformation? Jan 5, 2020 at 23:47
• Which two specific events did you have in mind? Also, keep in mind that whether two events are simultaneous depends on your reference frame - if two events are simultaneous in one frame, they won't necessarily be simultaneous in another frame. Jan 5, 2020 at 23:50
• Jan 6, 2020 at 0:15