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 EVOLUTION OF UNIVERSE                         World scientist James Pebbles won the 2019 Nobel Prize in Physics for his contributions to the theory of the origin and evolution of our universe.  In this article, he describes the ideas he co-authored with Scientific American in 1994.  At a particular moment about 15 billion years ago, all the matter and energy we could see, concentrated in a region smaller than a penny, began to expand and cool at an astonishingly fast rate.  The forces of nature assumed their current properties until the temperature of the Sun's core dropped 100 million times, and the elementary particles, known as quarks, were moving freely in the ocean of energy.  When the universe expanded 1.0 times, the size of the solar system was filled with everything we could count on.  At that time the free quark was trapped in neutrons and protons.  As the universe grew by another factor of 1.0, protons and neutrons came together to form the nucleus, which contains most o