A representation of the evolution of the universe over 13.77 billion years. The far left depicts the earliest moment we can now probe, when a period of "inflation" produced a burst of exponential growth in the universe. (Size is depicted by the vertical extent of the grid in this graphic.) Credit: NASA's Goddard Space Flight Center For decades, astronomers have known that the universe is expanding. To determine how fast it is growing today, scientists calculate a value called the Hubble

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