If you think about it, black holes aren't actually that heavy. By this i mean that a black hole is essentially just the mass of a very large star however compared to a galaxy containing billions of stars, it is extremely lite. So what makes a black hole a 'black hole' and a galaxy, with many billions of times its mass, not a 'black hole'. Well it turns out that a black hole is the way it is because of its density and not just because of its mass. Using the formula density = mass/volume we can see that if the volume is small enough, any mass could become a black hole.This volume is called the schwarzchild radius. Mathematically speaking, any object could become a black hole!
For example:
Mount Everest has a schwarzchild radius of about a nanometer.
Earth has the schwarzchild radius of about the same size as a cherry.
You and I have a schwarzchild radius of about 8.2x10^-17 nanometers while your mother has one about the same size as an apple. And now, here is a picture of a black hole for you to enjoy...
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