How Big is Space? We Asked a NASA Expert
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YouTubeNASA
How Big is Space? We Asked a NASA Expert
How big is space? It’s one of the most mind-bending questions we can ask because the deeper we look, the more the universe keeps going. We’ve measured billions of light-years in every direction and still haven’t reached the edge. A NASA scientists explains what we know — and don’t know — about the size of the cosmos. Explore more ...
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