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How much do we really know about the universe? It is said that the universe that we humans can observe is very small compared to the size of the entire universe. Let's talk about the mysteries of the universe that we have discovered so far. Reference https://astronomy.com https://phys.org/space-news/astronomy/ https://solarsystem.nasa.gov http://www.nasa.gov / @northropgrummanmedia https://ko.wikipedia.org/ https://www.wikitree.co.kr/ https://brunch.co.kr/ https://ocw.snu.ac.kr/ https://webzine.kps.or.kr/?p=5_view&i...