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Tue, Jul. 12th, 2011, 10:18 am
Physicists! Help me out!

There is a phenomenon in which two entities, traveling in opposite directions, on opposite sides of a fixed, solid object, are blocked from viewing the other entity by the fixed object because their respective traveling speeds are such that the fixed object is always directly in their line of sight.

WHAT IS THIS PHENOMENON CALLED?

/Science!
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