Hmm. In these sort of thought experiments it would seem a bit much to suppose that 100 light years from Earth there's a sign on the hyperspace freeway that says

Hmm. In these sort of thought experiments it would seem a bit much to suppose that 100 light years from Earth there's a sign on the hyperspace freeway that says "Quantum Gravity Ends Here" or "c = 299792458m/s Please Drive Carefully". More like physical constants vary imperceptibly over vast distances. And, given this continuity if you built an instrument to measure stuff and took it to another zone it would show the same readings as everything else would adjust to allow it to exist and be observed. cool thread