How big are supermassive black holes?

Answer 1

Supermassive black holes are surprisingly small.

The supermassive black hole at the centre of our galaxy is about the size of our solar system. The radius of a black hole is described by the Schwarzschild radius: #R=(2GM)/c^2# Where R is the radius of the black hole, G is the gravitational constant, M is the mass of the black hole and c is the speed of light.

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Answer 2

Anna Armstrong

The mass of a supermassive black hole can range from millions to billions of times that of the Sun.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.