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Listener Questions 41: Questions about the mass of the Universe, moons made of gas, and backyard blackholes.

Daniel and Kelly’s Extraordinary Universe

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How to Make a Black Hole

Black holes are not about enormous amounts of mass they're really about the density of mass so you could take almost anything and if you squeeze it down enough into a small enough radius high enough density then you'll form an event horizon. The calculation is called the short-siled radius. It tells you the radius of the event horizon for a given mass. If I formed an earth mass black hole and then got really really close to it like a centimeter two centimeters even a meter its gravity would be much more powerful than the gravity we feel here on the surface of the earth because that'd be much much closer.

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