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nebula colorful smoke fire universe space celestial body nature beautiful spectacular fantasy mystery exploration discovery secret unknown infinite eternal cycle continuous change development evolution time space matter energy conservation conversion balance harmony unity diversity complexity order chaos symmetry asymmetry proportion scale structure level dimension singularity black hole white hole wormhole string membrane field force interaction gravity electromagnetism strong nuclear force weak nuclear force higgs boson quark lepton electron proton neutron atom molecule state of matter solid liquid gas plasma bose-einstein condensate superconductor superfluid