“Space Facts are the best facts” – Einstein (probably)
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In 1915, Einstein publishes his initial theory of general relativity, which only has dynamic solutions (either the universe is expanding or contracting). In 1917, he adds the cosmological constant Λ to his theory to allow for static solutions (the universe is fixed in size). He would later describe in 1931 this decision as his greatest blunder, when he accepts the universe is expanding and that Λ is zero due to observations from Hubble. It turns out that his greatest blunder was thinking that his introduction was a blunder, as more recent cosmological data suggests Λ is small but positive (non-zero), and is at the heart of the contradictions in unifying General Relativity and Quantum Mechanics.
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The sun is 1.3 million times larger in volume than the earth.
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Astro Bros Space Facts 
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