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nebula space stars galaxy universe astronomy science nature exploration discovery mystery unknown cosmos void infinity eternal universe space star planet galaxy nebula black hole white dwarf red dwarf brown dwarf supernova nova quasar blazar pulsar magnetar dark matter dark energy cosmic microwave background big bang inflation multiverse string theory m-theory loop quantum gravity causal dynamical triangulation asymptotic safety emergent gravity quantum gravity general relativity special relativity schwarzschild metric kerr metric friedmann-lemaître-robertson-walker metric de sitter metric anti-de sitter metric poincare metric minkowski metric euclidean metric hyperbolic metric riemannian metric lorentzian metric metric tensor curvature tensor einstein field equations yang-mills equations dirac equation schrödinger equation klein-gordon equation maxwell equations navier-stokes equations euler equations relativistic navier-stokes equations relativistic euler equations magnetohydrodynamics plasma physics fluid dynamics solid mechanics structural mechanics continuum mechanics thermodynamics statistical mechanics quantum mechanics quantum field theory string theory m-theory loop quantum gravity causal dynamical triangulation asymptotic safety emergent gravity quantum gravity general relativity special relativity schwarzschild metric kerr metric friedmann-lemaître-robertson-walker metric de sitter metric anti-de sitter metric poincare metric minkowski metric euclidean metric hyperbolic metric riemannian metric lorentzian metric metric tensor curvature tensor einstein field equations yang-mills equations dirac equation schrödinger equation klein-gordon equation maxwell equations navier-stokes equations euler equations relativistic navier-stokes equations relativistic euler equations magnetohydrodynamics plasma physics fluid dynamics solid mechanics structural mechanics continuum mechanics thermodynamics statistical mechanics quantum mechanics quantum field theory