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The Big Bang Theory
An article about Astronomy & Deep Space
The Dopper Effect shows that the Universe is expanding, and therefore the Universe must have been much smaller in the distant past. Today, scientists explain the formation of the Universe with the Big Bang Theory. A massive explosion occurred (The Big Bang), hurling the universe outwards in all directions. At this moment, time and space were created. When you look out into space, your perception of the movement of galaxies is really the Universe continuing to expand. In addition, elapsing time is really the expansion of time.
When we observe galaxies several light years away, we are really looking back in time as it was years ago.
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