The best way to visualize gravity (for me!) was when I went to a science museum as a kid. Spacetime is like a blanket. When you put something heavy in the middle, it warps. I didn’t know it as a kid, but the ingenious way to raise funds for the museum was to put a coin in a slot that fed into the top of a metal cone. It would roll and circle around until it met it’s doom. A hole in the bottom that was a “black hole.” Just like planets today.
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