When you think about the Big Bang, you probably think it's when everything in the universe first appeared. But in fact, it took a little while for galaxies, planets, and even light to come into being. Fraser Cain explains how long the universe had to wait to turn the lights on in the video below.
When Did Light Appear In The Universe?
It's called the "era of recombination."
How Old Is The Earth?
Discover the age of our home planet.
The Big Bang
Find out the cause of existence as you know it.
Written by Curiosity Staff November 8, 2016
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