Perhaps the simplest and most intuitive definition of a black hole is an object whose gravity is so strong that nothing can
escape, even at the speed of light. To understand this better, we can consider the idea of escape velocity. Imagine we
are standing on the Earth and throwing a ball up in the air. The faster the initial speed of the ball, the higher the ball will
go before it comes back down. Based on our understanding of gravity, as two objects move apart the forces between
them decreases proportional to the square of the distance -- this is given by the famous equation which many may
remember from their physics education: F = GMm/R2
(where F is the force, G is the gravitational constant, M and m are
masses of the objects, and R is the distance between them). So as we throw the ball higher and higher, the pull of gravity
on the ball becomes weaker and weaker, and we can imagine throwing the ball with such high speed that it leaves the
gravitational field of the Earth completely and flies far into space. The speed at which this happens is called the escape
Perhaps the simplest and most intuitive definition of a black hole is an object whose gravity is so strong that nothing canescape, even at the speed of light. To understand this better, we can consider the idea of escape velocity. Imagine weare standing on the Earth and throwing a ball up in the air. The faster the initial speed of the ball, the higher the ball willgo before it comes back down. Based on our understanding of gravity, as two objects move apart the forces betweenthem decreases proportional to the square of the distance -- this is given by the famous equation which many mayremember from their physics education: F = GMm/R2 (where F is the force, G is the gravitational constant, M and m aremasses of the objects, and R is the distance between them). So as we throw the ball higher and higher, the pull of gravityon the ball becomes weaker and weaker, and we can imagine throwing the ball with such high speed that it leaves thegravitational field of the Earth completely and flies far into space. The speed at which this happens is called the escape
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