Einstein's Biggest Blunder, Explained

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This video is about how Albert Einstein made a mistake when applying the Field Equations of General Relativity to cosmology (in particular, to a static, constant density universe), and solved the problem by introducing the cosmological constant, rather than allowing for a dynamic universe with a scale factor - that is, the Friedmann-Lemaitre-Robertson-Walker universe, first developed by Alexander Friedmann of Russia. Later, it was discovered by the Slipher and Hubble red-shift that the universe is indeed expanding, and even later, by Schwarz and company in 1998, that the expansion is accelerating - aka, dark energy. And the cosmological constant was re-introduced.

REFERENCES

The Einstein Field Equations
https://en.wikipedia.org/wiki/Einstein_field_equations

Interrogating the Legend of Einstein’s “Biggest Blunder”
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https://www.youtube.com/watch?v=0RApKeMGDnE