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Curated by: Physics Made Easy (117 videos)
Discover how stars stay stable for billions of years. It is a delicate balance between the inward pressure of gravity and the outward forces due to nuclear reactions in the core that gives a star its stability. Forces so large and powerful that always end in balance… So beautiful! Watch the full lecture if you want to know what is going on in a star during its main sequence (this short is an extract). In the full video, it’s a fine blend of astrophysics and nuclear physics that awaits you and that will you make you understand how a star generates its energy during its main-sequence phase, and also how long it can do that for! Have Fun! #physics #gravity #nuclearphysics 00:04 The mass of the Sun 00:15 Gravity is trying to crush stars but fails… 00:31 Why inward and outward forces in a star always balance out? 01:13 What is a Hydrostatic Equilibrium? Video Production, Script, Animation, Music and Presentation © Edouard Reny 2026