Michael Armstrong: What is Time? | Space News

Modern cosmology fuses the concepts of space and time into a thing, called a four-dimensional continuum. Albert Einstein predicted, and recently scientists have claimed to observe ripples in the so-called fabric of space-time. But is it valid to define time in such a way as to reify it, and does a more valid definition of time exist? Today, we explore one of the most basic questions in all of cosmology: What is time?

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