An Introduction to Black Hole- Star Eater

A Black Hole is a place in space where gravity pulls so much that no particles even light can’t escape that part of space. The gravity is so strong because matter has been squeezed into a tiny space. The boundary of the region from which no escape is possible is called the event horizon. This can happen when a star is dying. Because no light can escape, people can't see black holes. They are invisible. Space telescopes with special tools can help find black holes. The special tools can see how stars that are very close to black holes act differently than other stars. In many ways a black hole acts like a black body, as it reflects no light. Black holes were long considered a mathematical curiosity; it was not until the 1960s that theoretical work showed they were a generic prediction of general relativity. The discovery of neutron stars by Jocelyn Bell Burnell in 1967 sparked interest in gravitationally collapsed compact objects as a possible astrophysical reality. Black holes of stellar mass are expected to form when very massive stars collapse at the end of their life cycle. After a black hole has formed, it can continue to grow by absorbing mass from its surroundings. By absorbing other stars and merging with other black holes, supermassive black holes of millions of solar masses may be formed. There is consensus that supermassive black holes exist in the centers of most galaxies.

All of us know about Professor Stephen hawking. Professor Stephen Hawking dedicated much of his career to unravelling the mysteries of black holes, and now the final chapter of his research on the “information paradox” is even online. Days before his death the renowned physicist and cosmologist completed work with colleagues at Cambridge and Harvard universities on a theory of what happens to the information in objects that fall into black holes. Malcolm Perry, a professor of theoretical physics at the University of Cambridge and a co-author on the paper, “Black Hole Entropy and Soft Hair”, said in the Guardian that the information paradox was “at the centre of Hawking’s life” for more than 40 years. Hawking’s theory suggested that the information in objects entering a black hole would disappear and will be lost forever. This contradicted a basic law of quantum mechanics, which demands that information relating to an object is never lost, and gave rise to concept of “the information paradox”.

In 1974, Stephen Hawking made one of his most famous predictions: that black holes eventually evaporate entirely. According to Hawking's theory, black holes are not perfectly "black" but instead actually emit particles. This radiation, Hawking believed, could eventually siphon enough energy and mass away from black holes to make them disappear. The theory is widely assumed to be true but was once thought nearly impossible to prove. It was for the first time that physicists have shown this elusive Hawking radiation — at least in a lab. Though Hawking radiation is too faint to be detected in space by our current instruments, physicists have now seen this radiation in a black hole analog created using sound waves and some of the coldest, strangest matter in the universe.

A curiosity is that, “Could a Black Hole Destroy Earth?” (Ref. is an article which is a part of the NASA Knows! (Grades K-4) series.) Black holes do not go around in space eating stars, moons and planets. Earth will not fall into a black hole because no black hole is close enough to the solar system for Earth to do that. Even if a black hole the same mass as the sun were to take the place of the sun, Earth still would not fall in. The black hole would have the same gravity as the sun. Earth and the other planets would orbit the black hole as they orbit the sun now. The sun will never turn into a black hole. The sun is not a big enough star to make a black hole.