A black hole is a region in space with gravitational pull so strong that nothing, not even light, can escape.
Class 11 Physics
Gravitation
CBSE EXAM 2024-25
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Super-dense planetary material is described as a black hole, which occurs when massive stars undergo gravitational collapse. In the event of a star burning out its nuclear fuel, it can no longer support itself against the force of gravity, thus causing a catastrophic implosion. During this process, the core of the star collapses into an incredibly dense point, creating a region in space where the gravitational pull is so strong that nothing, not even light, can escape. This is what gives rise to the term “black hole.”
The boundary which encloses the black hole is called the event horizon, signifying the boundary from which escape is impossible and past which, if any form of matter or radiation will pass, that is drawn in absolutely and irrecoverably into a black hole. Black holes occur in a spectrum of sizes that vary from as small as those produced by stars which have at their end become supermassive, containing billions to millions times the mass of the Sun.
Despite their enigmatic nature, black holes continue to play an important role in the universe, for instance, dictating the movements of nearby stars and gas. Their existence might also be very helpful in understanding various fundamental aspects of physics, specifically the nature of gravity and fabric of space-time.
See here for more : – https://www.tiwariacademy.com/ncert-solutions/class-11/physics/chapter-7/