What happens to matter and light that falls into a black hole, and what are some of the theories about the interior of a black hole?

What is a black hole?

The ‘Black Hole’ theory waspropounded by [UPPCS (Mains) 2016UPPCS (Pre) 1996](A) C.V. Raman(B) H.J. Bhabha(C) S. Chandrashekhar(D) Hargovind Khurana8. A ‘black hole’ is a body in spacewhich does not allow any typeof radiation to come out. Thisproperty is due to its [IAS (Pre) 2000](A) Very small size(B) Very large size(C) High density(D) Very low density9. The terms ‘Event Horizon’,‘Singularity’, ‘String Theory’ and‘Standard Model’ are sometimesseen in the news in the context of[IAS (Pre) 2017](A) Observation and understandingof the Universe(B) Study of the solar and the lunareclipses(C) Placing satellites in the orbit ofthe Earth(D) Origin and evolution of livingorganisms on the Earth10. ‘Super Nova’ is[UP Lower Sub. (Mains) 2015](A) An asteroid (B) A black hole(C) A comet (D) A dyning star11. How many constellations are in ourSpace? [44th BPSC (Pre) 2000](A) 87 (B) 88(C) 89 (D) 9012. Which one of the following is not anAstronomical object?[UPPCS (Pre) 1996IAS (Pre) 1993](A) Pulsar (B) Brittle star(C) Black hole (D) Quasar13. A group of stars arranged in aparticular shape, is called[UPPCS (Pre) 2013](A) Milky Way (B) Constellation(C) Andromeda (D) Solar system

The ‘Black Hole’ theory waspropounded by

Which one of the following is true about black holes?Group of answer choicesNothing can escape from a black holeThey have small size and very large massThey have small mass and large sizeA and BAll of the above

f-century.  A black hole is a region of space where the force of gravity is especially strong and gravitational potential energy U is very large.  Analogous to the electrostatic potential energy associated with electrical charges, U is defined as the work required to move an object of mass m from an infinite distance to a point at radial distance r within the gravitational field of a second mass M as given byU=−GMmr𝑈=-𝐺𝑀𝑚𝑟Equation 1where G is the gravitational constant.  Near a black hole, the gravitational potential energy can become so negative that not even light has enough energy to escape the black hole's gravity.Escape velocity can be determined by launching an object of mass m with velocity v to an infinite radial distance from the surface of a central mass M (eg, a star or a planet) with radius R.  For a black hole to exist, the escape velocity must be equal to the speed of light.Scientists have thoroughly studied the physics of black holes.  Stars near the center of our galaxy have been observed to orbit an extremely massive, invisible object (millions of times more massive than our Sun) that is almost certainly a black hole.  The orbital angular velocity ω of a star is defined asω=360°⋅f𝜔=360°⋅𝑓Equation 2where f is the frequency of rotation in hertz (Hz).  Likewise, black holes are not merely static masses but are often observed to rotate about their own axis.  The interaction between the rotation of a black hole and matter falling into the hole is suspected to form powerful beams (jets) of ionized matter that project away from the black hole along its axis of rotation.  Nevertheless, many aspects of how these jets are formed remains a mystery.  Black holes will remain a fruitful area for research far into the future. Question 13An object is launched with a one-time burst of propulsion away from the surface of the Moon.  After the burst, which of the following best describes the changes that occur as the object moves away from the Moon's surface?A.The object mass is dissipated as heat.B.Potential energy is converted into kinetic energy.C.Kinetic energy is converted into potential energy.D.Total mechanical energy is not conserved.Submit