MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Expanding universe. Computer illustration of the expanding universe represented in a bubble. The universe is thought to be expanding as all galaxies are moving away from each other and the further apart they are, the faster they are moving away. This observation led to the theory of the Big Bang, in which the universe expands like an inflating bubble from a central explosion.
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