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russ_watters
#3
Jun7-05, 11:27 AM
Mentor
P: 22,237
Like you, Anamalous, most scientists before Einstein assumed speed was relative (including the speed of light) and time was constant. As it turns out, they were wrong: time is relative and speed (of light) is constant.

How do we know? We measure both the (relative) rate of the passage of time and the speed of light on a virtually constant basis.