In your own words, explain what a black hole is and how it forms by integrating the information from the two sources.

A black hole is a region of spacetime where gravity is so strong that nothing, including particles and electromagnetic waves such as light, can escape.

What is a black hole?The formation of the black hole is occurs by the demise of massive stars.Details of a black hole's structure can be determined using Albert Einstein's general theory of relativity. When an object's internal pressure is inadequate to resist its own gravity, gravitational collapse happens. This happens when a star has insufficient "fuel" to sustain its temperature through stellar nucleosynthesis, Or when a star that would otherwise be stable obtains more matter in a way that does not raise its core temperature.In either situation, the temperature of the star is no longer sufficient to keep it from collapsing under its own weight.

Thus, that's how formation of a black hole happens.

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According to the General Theory of Relativity, a black hole is a region of space from which nothing, not even particles that move at the speed of light, can escape because their velocity is less than the escape velocity of these infinitely dense celestial bodies . This is the result of the deformation of space-time, caused after the gravitational collapse of a massive star with at least 30 times the mass of the Sun in a supernova, and that soon after, will disappear, giving place to what Physics calls singularity, the heart of a black hole, where space-time ceases to exist. A black hole starts from a spherical surface called the event horizon, which marks the region from which, if something to cross, can not return. The black adjective in black hole is due to the fact that it was assumed that it did not reflect any part of the light that reaches its horizon of events, acting as if it were a perfect black body in thermodynamics, however, there is currently the theory of radiation Hawking, who briefly predicts that black holes are not really black, and emit radiation due to quantum effects such as quantum fluctuations.

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