I have two questions about probability waves. Are we supposed to consider them as real physical waves, or are they just used to explain certain phenomenon? Should I consider them as real as the the earth itself? Does the probability wave collapse simultaneously in all frames of reference? If it doesnt then for an electron measured in California, could still be found in the center of the galaxy to an observer in motion relative to the earth, and what would happen if he did find it even though it had been found in California? Would there suddenly be two electrons? I thought that he couldn't find it because it had already been measured, but according to his frame (which is just as valid as any others) the measurment may not have happened so he could find the electron in the center of the galaxy, right?