- Many astronomers think that everything in the universe was once packed together in one small lump. Then, about 15 billion years ago, there was a gigantic explosion which they call the Big Bang.
The big bang explotion
- The Big Bang explosion sent the young universe flying out in all directions. Over vast ages of time, bits came together to make galaxies.
- The galaxies are still speeding apart today, and the universe is getting bigger.
- To see how the universe is getting bigger, watch the spots as you blow up a spotty balloon.
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