The life cycle of a star is dependent on its mass. The larger the mass, the quicker it will die out, whereas stars which are no more than half the size of our Sun can live up to hundreds of billion years. However no matter how large the star is, they all begin their lives in a nursery known as a molecular cloud. A molecular cloud is a giant condensation of dust and molecular gas. They are regions of relatively dense interstellar gas and dust with hydrogen molecules as well as carbon and silicate materials forming the primary constituents. Helium and small amounts of heavier elements are also found within the cloud. Molecular clouds are very cold and dark regions with typical temperatures of between 10 and 50 Kelvin. The mass of a typical molecular cloud ranges from 100-1,000 solar masses. However there are larger clouds known as giant molecular clouds which have a mass ranging from 1,000 to 1 million solar masses. They range in diameters from 20 to 200 parsecs (1pc ~ 3.26ly), making them “the largest gravitationally bound objects in the Galaxy, and the largest known objects in the Universe made of molecular material”, according to Astrophysicist Paul Ruffle of Manchester University. It is believed all stars are born within these regions of the interstellar medium and observations have shown that they are located primarily within the disk of spiral galaxies and the active regions of the irregular galaxies. Since molecular clouds are cold, dark and dusty, we cannot observe them directly in visible light. However larger wavelengths such as infrared and submillimeter (wavelengths within the range of 0.3-1mm) techniques can pass through the clouds unaffected which can make observations of a star forming. The peak temperatures obs... ... middle of paper ... ...xplode. These occur when the core has gained so much mass that it cannot withstand its own weight. What happens after this depends on the size of the core. If the mass of the star is between 1.44 and 3 solar masses then it will end up as a neutron star. These are extremely dense objects where the core of the star collapses under gravity. The gravity is so strong that the electrons and protons form to combine neutrons. On the other hand, if the mass of the star is greater than 3 solar masses than the degeneracy pressure is not enough to oppose its gravitational force, causing it to collapse in on itself. The gravity of a black hole is so strong that not even light can escape its pull. This is because all the matter which was present in the star has been compressed into a tiny area. It is believed that there is a supermassive black hole in the centre of each galaxy.
Starting with black holes, Khalili describes the creation of one. I found that a black hole is what remains when a massive star dies. Because stars are so massive and made out of gas, there is an intense gravitational field that is always trying to collapse the star. As the star dies, the nuclear fusion reactions stop because the fuel for these reactions gets burned up. At the same time, the star's gravity pulls material inward and compresses the core. As the core compresses, it heats up and eventually creates a supernova explosion in which the material and radiation blasts out into space. What remains is the highly compressed and extremely massive core. The core's gravity is so strong that even light cannot escape. This object is now a black hole and literally cannot be seen because of the absence of light. Because the core's gravity is so strong, the core sinks through the fabric of space-time, creating a hole in space-time. The core becomes the central part of the black hole called the singularity. The opening of the hole is called the event horizon. Khalili describes that there are two different kinds of black holes:
The movie, “Twenty Feet From Stardom,” was released in 2013. It focuses on the careers of backup singers, who have shared their voices to support some of the greatest artists of the past several decades. The film is an interview-based documentary. From the film, we meet a serious of amazing and talented vocalists, such as Darlene Love, the first black backup singer; Merry Clayton, a lead backup singer; Lisa Fisher, Tata Vega, and Judith Hill. They all share their stories of enjoyment, happiness, or even struggles in making music with others. There is no doubt on the fact that backup singers take very low credit, sometimes even no credit at all. They often just go there and make the thing sound great, and then go home quickly. It is even worse that sometimes people do not want to pay
In using this allusion, Frost not only continues the "poetic tradition" but adds all the depth of meaning of Keats' poem to his own. The star doesn't want much of us -- only to stay above us. He says that "when the mob is swayed" or when social, political, or moral upheaval takes place and the norm is to be radical, the star likes being above it all, condescendingly regarding the earth. When this happens, we should "choose something like a star" and concentrate on it.
For an example of a galaxy undergoing an interaction- induced starburst, let us look at M82, a member of a nearby group of galaxies. M82 is a rather disturbed-looking disk galaxy that is currently undergoing a massive amount of star formation in its nuclear region. The cause is theorized to be a close encounter between M82 and M81, its large neighbor, which occurred about a billion years ago (Lipscy & Plavchan 2003).
Black holes can be dangerous. They can be dangerous because they can suck anything up. There are large numbers of small stars being captured. They mostly grow from stars. The more they eat the bigger they get. This is how black holes grow (Science & Technology from the U).
Stars are born and reborn from an explosion of a previous star. The particles and helium are brought together the same way the last star was born. Throughout the life of a star, it manages to avoid collapsing. The gravitational pull from the core of the star has to equal the gravitational pull of the gasses, which form a type of orbit. When this equality is broken, the star can go into several different stages. Some stars that are at least thirty times larger than our sun can form black holes and other kinds of stars.
If the star is big enough and the pressure inside quickly disappears, gravity would and should slingshot the star into a tiny point with near infinite density with an extremely strong gravitatio... ... middle of paper ... ...is its anti particle. When these particles appear, they will shortly annihilate each other because they are exact opposites (UCR). However, if one of these particle pairs appears at the event horizon of a black hole, the gravity from the black hole will tear the pair of particles apart. The normal particle will have just enough energy to escape the black hole.
Waller, William H. The Milky Way: An Insider's Guide. Princeton, N.J: Princeton UP, 2013. 42+. Print.
A star begins as nothing more than a very light distribution of interstellar gases and dust particles over a distance of a few dozen lightyears. Although there is extremely low pressure existing between stars, this distribution of gas exists instead of a true vacuum. If the density of gas becomes larger than .1 particles per cubic centimeter, the interstellar gas grows unstable. Any small deviation in density, and because it is impossible to have a perfectly even distribution in these clouds this is something that will naturally occur, and the area begins to contract. This happens because between about .1 and 1 particles per cubic centimeter, pressure gains an inverse relationship with density. This causes internal pressure to decrease with increasing density, which because of the higher external pressure, causes the density to continue to increase. This causes the gas in the interstellar medium to spontaneously collect into denser clouds. The denser clouds will contain molecular hydrogen (H2) and interstellar dust particles including carbon compounds, silicates, and small impure ice crystals. Also, within these clouds, there are 2 types of zones. There are H I zones, which contain neutral hydrogen and often have a temperature around 100 Kelvin (K), and there are H II zones, which contain ionized hydrogen and have a temperature around 10,000 K. The ionized hydrogen absorbs ultraviolet light from it’s environment and retransmits it as visible and infrared light. These clouds, visible to the human eye, have been named nebulae. The density in these nebulae is usually about 10 atoms per cubic centimeter. In brighter nebulae, there exists densities of up to several thousand atoms per cubic centimete...
If the nebula is dense enough, certain regions of it will begin to gravitationally collapse after being disturbed. As it collapses the particles begin to move more rapidly, which on a molecular level is actually heat, and photons are emitted that drive off the remaining dust and gas. Once the cloud has collapsed enough to cause the core temperature to reach ten-million degrees Celsius, nuclear fusion starts in its core and this ball of gas and dust is now a star. It begins its life as a main sequence star and little does it know its entire life has already been predetermined.
Supernovas are extremely powerful explosions of radiation. A supernova can give off as much energy as a Sun can within its whole life. A star will release most of its material when it undergoes this type of explosion. The explosion of a supernova can also help in creating new stars.
One thing us as humans have never been able to fully understand is astronomy. Always having an unexplained mystery, astronomy also has served as a way to keep time and predict the future. The word “astronomy” is defined as the study of heavenly bodies, meaning anything in the sky such as stars, galaxies, comets, planets, nebulae, and so on. Many people, if not everyone, is amazed by the night sky on a clear, moonless night.
...um than they should, and some younger stars have far more. The lack of lithium in older stars is apparently caused by the "mixing" of lithium into the interior of stars, where it is destroyed. Furthermore, lithium is produced in younger stars. Though it transmutes into two atoms of helium due to collision with a proton at temperatures above 2.4 million degrees Celsius (most stars easily attain this temperature in their interiors), lithium is more abundant than predicted in later-generation stars, for causes not yet completely understood.
The Universe is a collection of millions of galaxies and extends beyond human imagination. After the big bang, the universe was found to be composed of radiation and subatomic particles. Information following big bang is arguable on how galaxies formed, that is whether small particles merged to form clusters and eventually galaxies or whether the universe systematized as immense clumps of matter that later fragmented into galaxies (Nasa World book, 2013). A galaxy is a massive area of empty space full of dust, gases (mainly 75% Hydrogen and 25%Helium), atoms, about 100-200 billion stars, interstellar clouds and planets, attracted to the center by gravitational force of attraction. Based on recent research, 170 billion galaxies have been estimated to exist, with only tens of thousands been discovered (Deutsch, 2011).
The education system in India is based on forced learning that kills student’s spirit and zest of learning. In the film “Like Stars on Earth,” we look specifically at the draw backed role played by parents and teacher in Indian education system. We follow the story of a dyslexic Indian boy, Ishaan, who always had trouble coping with his studies, but in the end with the help of an understanding teacher he is able to study normally and catch up with his peers. We will analyze this film using the concepts from Practices of Looking to explain our thesis. Eddie will cover the concepts of encoding and the ideology surrounding Indian education; Kiranjot Singh will explain the concepts of punctum, negotiated reading and producer’s intended meaning;