# Does the mass of a star change as it collapses into a black hole?

I know (I think!) that when a really big star collapses on itself it creates a black hole. My question: When a star collapses, is the mass equal to the mass of the star when it's not a black hole? Or does it change while collapsing? This question came to me and my friend while studying Newton's law: $$F=G \\frac{m_1 \\cdot m_2}{r^2}$$ If the mass of the star doesn't change, then it can't have enough force to "eat" light (unless it has that force in the first place). Does the force change because of the density?

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Michael H.

Okay, for some reason that article actually states that r = 2GM/c^2.
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07/17/19

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