Michelson-Morley experiment Speed of earth relative to ether c-v C+y 2 C-1 M ∧t, Rotating No significant fringe shift*Michelson-Morley experiment 5 1 l l t c v c v = + − + 2 2 2 2l t c v = − No significant fringe shift! v C < < < M M’ S Speed of earth relative to ether? t, Rotating