What is a black hole?
In simple terms, a black hole is a visually undetectable region of space that exerts a gravitational force so powerful that not even light can escape [Wald 1984, pp. 299–300], thus exhibiting the characteristics of an ideal black body in the sense that it absorbs all the radiation that falls on it [Schutz, Bernard F. (2003). Gravity from the ground up. Cambridge University Press. p. 110]. In addition, all black holes are enveloped by spherical “boundaries” known as “event horizons”, which defines a point from beyond which it is impossible to escape once it is crossed.
One notable feature of event horizons is the fact that they seem to radiate Hawking radiation, a form of radiation predicted by Steven Hawking, that
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Nonetheless, if the remnant is more massive than about three to four solar masses, a condition that satisfies the Tolman–Oppenheimer–Volkoff limit [Oppenheimer, J. R.; Volkoff, G. M. (1939). "On Massive Neutron Cores". Physical Review 55 (4): 374–381], there is no known process that will prevent the remnant from contracting into a black hole [Carroll 2004, Section 5.8], although it is thought that quark degeneracy pressure may be able to do so in cases where the mass of the remnant equals, or nearly equals three solar masses, but there exists no empirical research or evidence to support this view.
History of black holes.
Contrary to popular belief, black holes were not the invention of Steven Hawking or Albert Einstein. Although Einstein first predicted the existence of black holes in his General Theory of Relativity as early as 1919, the idea that something could collapse to a point from which even light could not escape was first proposed by John Michell in 1783 in a communication to Henry Cavendish, who was a member of the Royal Society, and in the following terms: “If the semi-diameter of a sphere of the same density as the Sun were to exceed that of the Sun in the proportion of 500 to 1, a body falling from an infinite height towards it would have acquired at its surface greater velocity than that of light, and consequently supposing light to be attracted by the same force in proportion to its vis inertiae, with other
Furthermore existence that black holes exist comes from the observations of astronomers of bursts of energy which are detected and then lost. An event horizon is an area of space around a black hole for which nothing can escape, once an object or any matter crosses this event horizon the gravity of the black hole will be too strong for it to escape. As a cloud of gas swirls and nears a black hole, the gases heat up and will emit x-rays. Astronomers have observed instances of several burts of x-rays being detected and then disappearing at areas where black holes are thought to be found. This may be caused by the gases emitting x-rays and then crossing the event horizon and disappearing forever. The observations of these bursts of energy are useful for astronomers in finding black holes.
This paper will introduce you to the incredible topic which is black holes. A black hole is a region of space time exhibiting such strong gravitational effects that nothing can escape from inside it. (NASA) No human has ever entered a black hole and there is still a large mystery about them; we have very little idea of where the matter that enters them goes. A black hole cannot be looked into either, as it sucks all the light into the middle of it. Space programs use special satellites with certain features that allow them to see these black holes. A black hole can be big or small, sometimes forming when a star is dying. Some scientists speculate that there can be black holes just 1 centimeter large. There are multiple types of
Black holes are some of unusual and most interesting objects found in outer space. The first thing I learned, black holes are objects of the greatest density due to the strong gravity because mater has been squeezed into a tiny space. With the black holes relationships with mass and gravity, they have an extremely powerful gravitational force that even light cannot escape from their grasp if it comes near enough. Second thing I learned is about the inner region of a black hole, where its mass lies, is known as its singularity, the single pint in space-time where the mass of the black hole is concentrated. The third thing I learned that I found the most fascinating is if the earth ever falls into a black hole, one of the effect that will happen is “spaghettification,” which means if objects come too close to a black hole, it will stretch out, just like a spaghetti. This effect is brought about by a gravitational gradient across the object or a body. For example, if earth comes too close to a black hole, the nearest part of the planet will be pulled by an enormous gravitational pull, while leaving the farthest part with a small gravitational force. The fourth thing I learned is that the new hypothesis suggests that anything that touches a black hole will become an
Discovered in 1916 by Albert Einstein, a black hole is an area of space-time showing very strong effects, that nothing can escape from the black hole. Space-time is the belief that there is no time in space, so there is no aging or time whatsoever. There are three different types of black holes. Stellar-mass, supermassive, and intermediate. All three are very strong, but the supermassive is currently the strongest reported. Not all black holes are large, but extremely powerful. The supermassive black holes are the biggest type of black hole and most of the time are found in the center of massive galaxies. Stellar-mass black holes are formed by a star collapsing. Intermediate black holes are stronger than stellar-mass black holes, but weaker than supermassive. Supermassive is the least common black hole there is.
Scientists do not have the ability to directly observe black holes with telescopes that detect x-rays, light, or other forms of electromagnetic radiation. However, Scientists can infer the presence of black holes and study them by detecting their effect on other matter nearby. If a black holes passes through a cloud of interstellar matter, it will draw that matter inward in a process known as accretion. A similar process will occur if a black holes passes a normal star. So, after a black hole is created, it draws in anything in its path adding to the extreme amount of matter that is packed into that very small area.
At the end of the sun's life it will tar into a redgin star in a billion of years. The sun will throw off its over layers and become a plantery newborn. All that will be left of the sun is a cooling white dwan star. Nasa is learning black holes using spacecraft like the x-ray obvertory. They are also using ferm; grammarly ray space telescope (Dunbar). Black hole is a different kind of supernova. Black holes are hotter than stars. The center of a black hole is dense but not as hug itself. A black hole can be 2,000,000 times smaller than are sun. We can not observe black holes directly, but can be detected. Speed of light galaxies are have 20 billion solar masses. Univer stars gravitational field materact. Stars, light years, supernovas, and light bursts in the univers. The mass of the earth is 2,000,000 times smaller than the sun and can fit in your palm. Supermassive black holes culrk in the centers of the galaxies. The stares can become mostly iron, most stars elements in the universe. There may be camofluge black holes in are milkyway galaxy. Black holes are made by collapsed stars. Supermassive black holes might tie at many galaxies. A young star burns hydrogen at its core.
“Black holes are perhaps the most exotic objects to impinge on the cosmic consciousness. They are formed when matter such as that from a dying massive star collapses in calamitously under its own gravity. forming a region of space in which the gravitational is so strong that it swallows all matter and radiation that come near it.” - Christopher Reynolds (Anderson, 2010).
Not only that, but a lot of the science were correctly given correlating to Newton’s Laws and Einstein’s General Theory of Relativity. The The visualization of Gargantua revealed that black holes’ "accretion disks" of infalling material were twisted into intricate and unique shapes — a find that had quite an effect on Kip Thorne.
Aaron Peters Mrs. Smith Language Arts 24 October 2017 General Relativity General relativity affects people today, whether they are an astronaut or a zoologist. To understand general relativity, one must know how spacetime works, how black holes affect it, and how it affects humanity. General relativity is the idea that everything is made out of spacetime and that mass affects spacetime. One way to describe spacetime is by using a metaphor of a rubber sheet. The metaphor goes like this: a rubber sheet is stretched between two boards.
Black holes have been theorized since 1916. However, no scientist has ever discovered a black hole in certainty. In theory, A black hole is created when a star of three or more solar masses collapses. “One solar mass is equal to the mass of the sun,” (Mclintock 1). A star collapses when the outward push of the combustion reaction no longer has the required forces compete with the inward pull of gravity. Most astronomers believe that the Milky Way contains millions of theses invisible devils, which are massive stars that have collapsed. In theory, anything could become a black hole if it were simply compressed into its Schwarzschild radius. For instance, Mount Everest has a Schwarzschild radius that is less than a nanometer,
A blackhole occurs when a giant or supergiant start dies. But before the star dies their is a fusion reaction going on constantly throughout its life time. This fusion reaction can be di erent from star to star ff depending on its age. For a young star the reaction is a proton to proton fusion, a middle aged star can have a carbon reaction and a much older star, which is collapsing on itself has a helium fusion reaction. Once a star has finished reacting all of the helium it has the core begins to 'eat' it's self instead of the helium. This makes the core have a stronger and stronger gravitational pull. After the core has 'eaten or suck up everything into its fusion reaction it collapses due to so much compressed mass in a small space which forms a giant explosion creating a supernova which then turns into a singularity. Thus
Black holes are a staple in the study of our unknown universe. The current understanding of general relativity allows something like a black hole to exist due to the strange properties surrounding them, as well as the effects on their surroundings. Black holes are defined by Chaisson's Astronomy as "a region of space where the pull of gravity is so great that nothing, not even light can escape" (Chaisson, 2013). This definition is very broad, simply stating the effects of what we call a black hole. Indeed, there is a lot of thoughtful assuming done when discussing this phenomena, however, what if everything we thought we knew about black holes was wrong and black holes didn't actually exists. That is exactly what a small group of scientists and astronomers think is the case.
Coupled with new discoveries, black holes frequently cause series of events throughout a universe. According to The Gale Encyclopedia of Science, in their article titled, “Active Galactic Nuclei”, “Active Galactic Nuclei’s (AGNs) are located at the centers of some galaxies—perhaps most galaxies—and emit a tremendous amount of energy across part or all of the electromagnetic spectrum, sometimes on the order of trillion times the output of the Sun” (The Gale Encyclopedia of Science). In other words, AGNs are the center of the universe and can be violently energetic objects. Leading astronomers concluded that a super massive black hole was at the center of every AGN, and the main source of its power, containing a million to ten billion times the mass of the sun (The Gale Encyclopedia of Science). Eagerly,
There is proof that black holes do eventually disappear. But for most black holes this time for them to disappear is unimaginably long. But if there were to ever be a black hole the size of a cruise ship it would evaporate in the time of seconds. Because the flash of light that is created from all the light that is on a subatomic level being created or destroyed. This is irrelevant to any black holes in the universe because there is no known black holes the size of a cruise ship and the temperature that this light gives of is almost zero degrees and the energy loss is
Another method in physics on how to time travel is through black holes. A black hole has been discovered by Einstein's theory of general relativity, which showed that when a star dies, it leaves behind a small, dense remnant core. If the core’s mass is more than the sun, the force of gravity overwhelms all other forces in which it transforms into a black hole. Scientists have said that black holes can destroy anything that goes in it and it could be hard to get out of a black hole, once something went in it. In an interview by physicist Lior Burko, he states, “One possibility is that black holes may allow us to travel to very remote places in the universe, or another universe entirely,” (Kahney, “Black Holes and Space Time”). Black holes may have evidence that there are different kinds of parallel universe. Even though it is still unclear what black holes can do as in destroying everything that it goes in or if it leads someone to time travel into another parallel universe. Scientist are trying to create a black hole, here on earth, to see what blacks can do as in sending information to another universe.