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So, how big is the universe, really?


Spoiler alert: pretty big.

According to the Business Insider Science channel on YouTube, the American astronomer, cosmologist, astrophysicist, and astrobiologist Carl Sagan once claimed there are more stars out there in the universe than grains of sand on all of Earth’s beaches, but that in just 10 drops of water there are more water molecules than there are stars.

Since such proportions are quite hard to even imagine, Business Insider Science came up with this video, which helps put things in perspective.

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