How to Measure the Quantum Spin of Entangled Particles?

When measuring the quantum spin of entangled particles, how are the axes defined? When takes his particle to another galaxy, how does he determine his orientation? So what's going on in the background here is the idea of yoow, some kind of e p r experiment. Einstein pedolskin rosen said, imagine that you have two particles that are entangled. That may or may not be true. I'm not actually sure about this thing. It depends on a lot of details we dont know about what interstellar travel will eventually be like. But that, i think, that's why i wouldn't he wasn't trying to draw a distinction between human nature and alien nature in that sense.