How are black holes born?? Travel through Black Hole In Hindi || ब्लैक होल के माध्यम से यात्रा हिंदी में

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Travel through Black Hole In Hindi || ब्लैक होल के माध्यम से यात्रा हिंदी में

  Black holes can be used to travel into the  future only. So far as we know, our universe  prohibits traveling into the past.
 According to Einstein's theory of general  relativity, and to experimental evidence here  on earth assembled by Harvard physicists  Pound and Rebka, in the presence of a  gravitational field, an external observer  would see a clock in a strong gravitational    field tick more slowly. This is analogous to  the famous time dilation effect in special  relativity, except that in the 'gravitational  redshift' effect no motion between the  observer outside the gravitational field and  the clock located within the field, is required.

How are black holes born?? in Hindi || ब्लैक होल कैसे बनते है ??

 A black hole is born when an object becomes  unable to withstand the compressing force of  its own gravity. Many objects (including our  Earth and Sun) will never become black  holes. Their gravity is not sufficient to  overpower the atomic and nuclear forces of  their interiors, which resist compression. But in more massive objects, gravity ultimately  wins.

 Stellar-mass black holes are born with a  bang. They form when a very massive star (at  least 25 times heavier than our Sun) runs out  of nuclear fuel. The star then explodes as a  supernova. What remains is a black hole,  usually only a few times heavier than our Sun  since the explosion has blown much of the stellar material away.We know less about the birth of supermassive black holes, which are much heavier than stellar-mass black holes and live in the centers of galaxies. One possibility is that supernova explosions of massive stars in the early Universe formed stellar-mass black holes that, over billions of years, grew supermassive. A single stellar-mass black hole can grow rapidly by consuming nearby stars and gas, often in plentiful supply near the galaxy center. The black hole may also grow through mergers with other black holes that drift to the galactic center during collisions with other galaxies. Astronomers are actively investigating these and other scenarios through observations and computer simulations.