Do-it-yourself black hole

    When moving at near-light speed, a moving object begins to decrease and “become heavier” for the observer from the side. The consequence of a large mass is a large gravity.

    In order not to wander around the entire universe, you just need to rotate along two axes.
    You can calculate what the radial speed should be so that the linear one is close to the light.

    Total: we take some "ball", we begin to unwind it, at a certain speed we get a "black hole": small and mega-heavy.

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