What Existed before the Universe - What's Happened since the Big Bang

Nothing existed at the outset. After then, the cosmos began to take shape some 13.7 billion years ago. How this came to be or if there was ever a time before time is still a mystery. Yet, physicists have pieced together an approximate timeline of significant events in the cosmos' existence using telescope data and models of particle physics. From its beginning to its inevitable demise, we examine key points in the evolution of our universe here.
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