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Whirlpool Black hole Galaxy Nebula Space Vortex Astronomy Dark Matter Gravity Singularity Time Warp Dimension Event horizon Quantum mechanics Relativity Physics Science Cosmos Universe Planets Stars Milky Way Galaxy Nebula Interstellar Astronomy Exploration Discovery Mystery Unknown Supermassive Black hole Quasar Blazar Active galactic nucleus Supernova Neutron star Pulsar Magnetar White dwarf Brown dwarf Red dwarf Blue giant Red giant