Black Holes Informative Speech

Good morning 10F and Dr Guppy, I will be speaking about an astronomical phenomenon called black holes. A black hole is an area of space-time. Rather, it is a great amount of matter packed into a very small region it is also the last evolutionary stage in the lifetimes of vast stars. This makes the black hole invisible to the rest of the universe, hence the word "black". A star, about 20 times the mass of the sun may produce a black hole at the end of its life. A black hole is formed by nuclear reactions in the core of a star producing enough energy and pressure to push outward, the gravity and pressure balance each other keeping the star stable, however when the star runs out of nuclear fuel, gravity causes the material in the core to compress even further, collapsing it under its own weight. When a massive star runs out of its nuclear fuels it explodes, this explosion is known as a supernova. Most black holes form from the fragments of a massive star that dies
Redshifts happen when light or other electromagnetic radiation from an object is increased in wavelength and moved towards the red end of the spectrum. Eddington ratio is the accretion rate in units of the maximum possible accretion rate, in other words the growth by the gradual accumulation of additional layers of gas. Eddington ratio measures the mass of black holes. This article suggests that black holes can be formed due to gas accretion in nuclear stellar clusters. The evidence found from this article is not supported from other researchers study. Laura Mersini-Houghton from the University of North Carolina says “the mathematics are conclusive; they do not exist.” However, experimental evidence may one day provide physical proof as to whether or not black holes