I never understood WHY the universe expands...until now!

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🌏 Get exclusive NordVPN deal here ➵ https://NordVPN.com/floatheadphysics It’s risk free with Nord’s 30 day money-back guarantee!✌ T shirts: Link to 'Don't be dx3/dt3 T-shirt' (Promo price) Light: https://floatheadphysics.com/products/dont-be-a-jerk-light Dark: https://floatheadphysics.com/products/dont-be-a-jerk-dark Henrietta Swan Leavitt, an American astronomer hired as human computer made a startling discovery. Not only did it help humanity realise that the universe is teeming with billions of galaxies, but it led Edwin Hubble to eventually discover that the universe must be expanding, eventually leading to the big bang theory. The entire paradigm shift is centered around her discovery. But what exactly did she discover? Chapters 00:00 The astronomer who made a startling discovery 01:07 Einstein's cosmological constant 02:54 Friedmann's counter argument against the constant 04:00 Vesto Slipher's puzzling discovery of the spiral 'nebulae' 07:40 The best measuring methods until the 1920s 09:04 A serious upgrade 10:50 Henrietta Levitt enters the story (Levitt's Law) 16:15 The paradigm shifts after Levitt's law 17:50 The Hubble Law 20:38 Einstein's blunder, or was it? This video was sponsored by Nord VPN