How big is the Universe explained in a way you will easily understand
The Royal Observatory of Greenwich, England, has crafted three simple animations to explain three very complex things: What's inside a black hole, how do we know the age of the sun—did you know the Sun weighs 4,000 trillion trillion hippopotamuses?—and how big is the Universe.

What's inside a black hole?

How Do We Know How Old The Sun Is?

How Big Is The Universe?

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