Question

Wick rotating this quantity yields a Euclidean metric when it is assigned “minus” in the signature. An invariant hyperbola whose major axis is vertical has intervals “like” this quantity. (20[3])Einstein developed a standard (20[1])for devices that measure this quantity (20[1])so that they always give the same one-way speed of light. (20[3])Muons (20[1])reach (20[1])Earth without decaying because they experience a (*) decrease in (10[1])this quantity (10[1])in the atmosphere. (10[2])The change in the (10[1])square of this quantity has a unique sign in the formula for d-s-squared. This quantity is the vertical axis of a light cone. (10[1])When traveling (10[2])near the speed of light, this quantity’s “dilation” (10[6])is observed. (10[6])For 10 points, name this quantity that is conflated with space in relativity. ■END■ (10[6])

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