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interstellar travel wormhole space galaxy nebula stars planets black hole white dwarf red dwarf brown dwarf rogue planet asteroid comet meteor interstellar medium cosmic dust cosmic microwave background dark matter dark energy Big Bang inflation universe multiverse spacetime general relativity special relativity quantum mechanics string theory M-theory loop quantum gravity causal dynamical triangulation asymptotic safety emergent gravity quantum gravity black hole thermodynamics black hole information paradox Fermi paradox Drake equation SETI interstellar communication interstellar travel warp drive Alcubierre drive wormhole Einstein-Rosen bridge