A fundamental principle in physics stating that for a gravitationally bound system in equilibrium, the total kinetic energy is equal to negative one-half the total potential energy. This theorem helps astronomers understand the balance between gravitational collapse and internal pressure in stars and galaxy clusters.
From Latin 'vires' meaning 'forces' or 'powers,' coined by German physicist Rudolf Clausius in 1870. The theorem was originally developed for thermodynamic systems but proved essential for understanding stellar structure and galactic dynamics.
The virial theorem explains why stars don't collapse under their own gravity and why galaxy clusters hold together! It's the cosmic balance sheet that keeps our universe structured - without it, we couldn't predict stellar lifetimes or understand how dark matter shapes galaxy clusters.
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