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  • View of a black hole in front of the Large Magellanic Cloud.
    Rights: Alain r - Own work, CC BY-SA 2.5 Published 18 June 2019 Size: 440 KB Referencing Hub media

    A black hole has so much mass tightly packed into a small space that, close up, its gravity is so strong that nothing nearby can escape it.

    To simulate a black hole on the gravity well, place a small metal ball on the sheet. Attach a strong magnet to the ball under the sheet and attach a heavy ball to the magnet. The sheet stretches downwards and simulates the infinite stretch of spacetime caused by an actual black hole.

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