Category: Level II
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Why Don’t We Call Spacetime a Substance?
In the previous essay, I asked what it means to say that spacetime curves. General relativity provides extraordinarily precise equations describing how curvature behaves, predicting planetary motion, gravitational lensing, black holes, and gravitational waves with remarkable accuracy (Einstein 1916; Abbott et al. 2016). Yet they remain silent on a deeper question: what, if anything, is…
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What Does it Mean for Spacetime to Curve?
What does it really mean when physicists say that “spacetime curves”? We hear the phrase often: planets orbit because space curves, light bends because space curves, gravity, we are told, is not a force but geometry. The language is so familiar that it can pass without reflection. But if we slow down for a moment,…
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What Does it Mean for Spacetime to Curve?
What does it really mean when physicists say that “spacetime curves”? We hear the phrase often: planets orbit because space curves, light bends because space curves, gravity, we are told, is not a force but geometry. The language is so familiar that it can pass without reflection. But if we slow down for a moment,…