This year marks the hundredth anniversary of Einstein's "miraculous year", 1905, when he
formulated special relativity, and explained the origin of the black body spectrum and
Brownian motion. In honor of this occasion, I will describe the modern view of
spacetime. After reviewing the properties of spacetime in general relativity, I will
provide an overview of the nature of spacetime emerging from string theory. This is
radically different from relativity. At a perturbative level, the spacetime metric
appears as ``coupling constants" in a two-dimensional quantum field theory.
Nonperturbatively (with certain boundary conditions), spacetime is not fundamental but
must be reconstructed from a holographic, dual theory. I will conclude with some recent
ideas about the big bang arising from string theory.
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