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    Illustration of two black holes orbiting each other in accretion disc. — Stock Photo
    Illustration of two black holes orbiting each other in accretion disc.
    Conceptual illustration of wormhole theoretical tunnel through spacetime. — Stock Photo
    Conceptual illustration of wormhole theoretical tunnel through spacetime.
    Conceptual representation of Einstein-Rosen bridge wormhole. — Stock Photo
    Conceptual representation of Einstein-Rosen bridge wormhole.
    Spherical or closed universe — Stock Photo
    Spherical or closed universe
    Illustration of black hole seen from above clouds of orbiting planet. — Stock Photo
    Illustration of black hole seen from above clouds of orbiting planet.