Martin Bojowald: Physics presents two conflicting views of time. One, which stems from quantum mechanics, speaks of time as a parameter that never stops flowing at a steady pace. The other, derived from relativity, tells scientists that time can contract and expand for two observers moving at different speeds, who will disagree about the span between events.
In most cases, this discrepancy isn’t terribly important. The separate realms described by quantum mechanics and relativity hardly overlap. But certain objects—like black holes, which condense enormous mass into an inconceivably tiny space—can’t be fully described without a theory of everything known as quantum gravity.
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