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star space astronomy night sky galaxy universe constellation nebula supernova black hole white dwarf red dwarf brown dwarf planet moon asteroid comet meteor meteoroid atmosphere stratosphere mesosphere thermosphere exosphere ionosphere magnetosphere aurora borealis aurora australis solar wind cosmic rays dark matter dark energy Big Bang inflation multiverse string theory loop quantum gravity M-theory general relativity special relativity quantum mechanics wave-particle duality Schrödinger's equation Heisenberg's uncertainty principle Pauli exclusion principle Bohr model