Outer space is really big. It’s so vast that we have to speak in terms of light years, or how far light travels in one year. As I mentioned before, when I was looking at the closest galaxy to ours, it was two million light years away! But most objects are much farther than that. Some are so far away that their light will never reach us. And the number of celestial bodies that we can’t see is increasing.
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A Universe From Nothing - Book Summary
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