Ask Astro: How did the Big Bang start from the size of a pinhead?

How is it possible, with all the matter in the universe, that the Big Bang started from the size of a pinhead? Pete Neiland Calgary, Alberta Our universe is and has been expanding throughout its history, and this means that it was hotter and denser in the past than it is today. Any given piece of space was smaller in the past than it is now. The fact that nothing can travel faster than the speed of light limits how much of our universe we can observe; the currently observable part of our u

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