Nobody downloaded yet

U10a2 Life Cycle of the Stars Paper - Essay Example

Comments (0) Cite this document
Summary
Introduction: A star is a massive, luminous ball of plasma held together by gravity. The nearest star to Earth is the Sun, which is the source of energy on Earth. Other stars are visible from Earth during the night when they are not outshone by the Sun or blocked by atmospheric phenomena…
Download full paperFile format: .doc, available for editing
GRAB THE BEST PAPER94% of users find it useful
U10a2 Life Cycle of the Stars Paper
Read TextPreview

Extract of sample "U10a2 Life Cycle of the Stars Paper"

Download file to see previous pages Astronomers can determine the mass, age, chemical composition and many other properties of a star by observing its spectrum, luminosity and motion through space. The total mass of a star is the principal determinant in its evolution and eventual fate. Other characteristics of a star are determined by its evolutionary history, including diameter, rotation, movement and temperature. A plot of the temperature of many stars against their luminosities, known as a Hertzprung-Russell diagrams (H–R diagram), allows the age and evolutionary state of a star to be determined. Stellar evolution is the process by which a star undergoes a sequence of radical changes during its lifetime. Depending on the mass of the star, this lifetime ranges from only a few million years (for the most massive) to trillions of years (for the least massive, which is considerably more than the age of the universe). Stellar evolution is not studied by observing the life of a single star, as most stellar changes occur too slowly to be detected, even over many centuries. Instead, astrophysicists come to understand how stars evolve by observing numerous stars at the various points in their life, and by simulating stellar structure with computer models. Stellar Evolution: A nebula is a cloud of gas (hydrogen) and dust in space. Nebulae are the birthplaces of stars. There are different types of nebula. An Emission Nebula which glows brightly because the gas in it is energized by the stars that have already formed within it. In a Reflection Nebula, starlight reflects on the grains of dust in a nebula. The nebula surrounding the Pleiades Cluster is typical of a reflection nebula. Dark Nebula also exists. These are dense clouds of molecular hydrogen which partially or completely absorb the light from stars behind them. 1st stage of a stars life: PROTOSTAR Stellar evolution begins with the gravitational collapse of a giant molecular cloud (GMC). As it collapses, a GMC breaks into smaller and smaller pieces. In each of these fragments, the collapsing gas releases gravitational potential energy as heat. As its temperature and pressure increase, a fragment condenses into a rotating sphere of superhot gas known as a prostar. Protostars with masses less than roughly 0.08 M (1.6?1029 kg) never reach temperatures high enough for nuclear fusion of hydrogen to begin. These are known as brown dwarfs. For a more massive prostar, the core temperature will eventually reach 10 million kelvins, initiating the proton-proton chain reaction and allowing hydrogen to fuse, first to deuterium and then to helium. The onset of nuclear fusion leads relatively quickly to a hydrostatic equilibrium in which energy released by the core exerts a "radiation pressure" balancing the weight of the star's matter, preventing further gravitational collapse. The star thus evolves rapidly to a stable state, beginning the main sequence phase of its evolution. A new star will fall at a specific point on the main sequence of the Hertzprung-Russell diagrams, with the main sequence spectral type depending upon the mass of the star. Small, relatively cold, low mass red dwarfs burn hydrogen slowly and will remain on the main sequence for hundreds of billions of years, while massive, hot super giants will leave the main sequence after just a few million years. A mid-sized star like the Sun will remain on the main sequence for about 10 billion years. . A star of less than about 0.5 solar mass will ...Download file to see next pagesRead More
Cite this document
  • APA
  • MLA
  • CHICAGO
(“U10a2 Life Cycle of the Stars Paper Essay Example | Topics and Well Written Essays - 1250 words”, n.d.)
Retrieved from https://studentshare.org/environmental-studies/1425324-u10a2-life-cycle-of-the-stars-paper
(U10a2 Life Cycle of the Stars Paper Essay Example | Topics and Well Written Essays - 1250 Words)
https://studentshare.org/environmental-studies/1425324-u10a2-life-cycle-of-the-stars-paper.
“U10a2 Life Cycle of the Stars Paper Essay Example | Topics and Well Written Essays - 1250 Words”, n.d. https://studentshare.org/environmental-studies/1425324-u10a2-life-cycle-of-the-stars-paper.
  • Cited: 0 times
Comments (0)
Click to create a comment or rate a document

CHECK THESE SAMPLES OF U10a2 Life Cycle of the Stars Paper

INDUSTRY LIFE CYCLE MODEL

...? INDUSTRY LIFE CYCLE MODEL of the School: The industry life cycle model is a continuous cyclethat every industry goes through in its life. It involves evolving of an industry over time right from its establishment to its full development. An industry evolves in terms of structures, sales, and overall returns. The environment in which the industry grows, also changes as the industry changes. The strategy of the business should be such that it is able to adapt to the changes in the environment. To understand evolution of an industry, we need to consider the life cycle of an industry with regard to Porter’s 5 forces. I am...
3 Pages(750 words)Essay

Industrial Life Cycle

...INDUSTRIAL LIFE CYCLE Life cycle refers to the concept of various stages which a thing goes through during its entire life. The concept of life cycle does not apply to human beings only; it is also applicable to industries as well. Just as a person is born, then he grows and matures, and eventually his life experiences a decline and finally he dies, similarly an industry is born, it then develops and grows. After attaining maturity it starts the declining process and finally the industry has to be shut down, that is it eventually dies. Industrial Life Cycle refers to the...
3 Pages(750 words)Essay

Product life cycle (PLC)

...Lecturer Product life cycle (PLC) I have chosen the food and beverage industry. I believe that companies in this industry face numerous challenges, for example, the stiff competition in the industry. Another key challenge is the ever-increasing regulatory requirement. Retailers demand high quality and cheap products from the industry. There is as well pressure from consumers who insist on food safety and healthy products. This paper will look into a couple of products in the food and beverage industry belonging to different stages of the product life cycle. Introduction Stage Pepsi Next is a beverage drink manufactured by Pepsi. Pepsi introduced it into...
5 Pages(1250 words)Assignment

Software Development Life Cycle

...? Software Development Life Cycle In development of organizations, there are times when the company has to improve its efficiency in service delivery through developing software that assists to ease the work. The process of developing software is one that involves a process that takes more than one phase and involves different specialists. The process of coming up with software in an organization is a process that has many elements and it is commonly referred to as Software Development Life Cycle (SDLC) (Langer, 2012). The analysis of SDLC shows its elements and indicates the different specialists that play various important roles to ensure that it achieves what was...
3 Pages(750 words)Essay

Life Cycle

...Life Cycle Introduction Life is never simple. Rather than anesthetize every discomfort, it makes sense to face the fear and confusion, feelit, and work through it. The moral life is not so much action as thoughtful action, and the moral fruit of action is not "results" but experience of life. But the introduction of thought into action changes the whole character of the problem. Moral problems are continuing problems, inviting contemplation. The moral results of action are not so much conclusions as new developments of older questions. The moral problem, in short, is the problem of life. Problems of business call for definite answers, to...
8 Pages(2000 words)Essay

Life Cycle of Stars

...Life Cycle of Stars The shining twinkle-twinkle little or big stars are all composed of enormous clouds of dust and gas. Stars too have a life of their own. These formations appear as twinkling to us because they are at a far off place from our earth and the atmospheric conditions, diffractions etc. lead to the phenomenon of twinkling. Light is actually an electromagnetic wave that can be 'seen' by us. Initially there was much discussion over whether light is composed of particles or waves. Subsequent experiment proved that Light displays a dual nature1. While on the one hand particles are supposed to have some mass which can respond to...
5 Pages(1250 words)Essay

LIFE CYCLE - PLASTIC BAGS

...given it affects the animal and marine life in many adverse ways and is conventionally manufactured from non-renewable natural resources. Besides, there are many other concerns associated with the use of plastic bags that are of huge significance to the environment and ecology. Use of plastic bags has been globally condemned and criticized with reasonable arguments. This paper elaborates the life cycle of plastic bags and critically analyzes the environmental effects of each stage of their life cycle. Furthermore, various alternatives that can help eliminate the draw backs of plastic bags while maintaining the capacity to deliver the...
9 Pages(2250 words)Essay

Life cycle of malaria

...28 March The Life Cycle of Malaria i. The Basic Life Cycle The comprehension of the life cycle of Malaria is important for several reasons. One, it aids researchers in the design and implementation of interventions that can be used to hinder transmission, infection and develop Malaria treatments. This is the purposes of this research. Four known plasmodium species are known to cause malaria; Plasmodium vivax, ovale, malariae and falciparum. It has been proved that it is the female anopheline mosquitoes that transmit the Plasmodium. a. Sporozoite Stage They suck human blood as a meal and in turn inject beings with the sporozoite stage...
1 Pages(250 words)Outline

Life cycle of malaria

....). It has been proved that it is the female anopheline mosquitoes that transmit the plasmodium. The body of this paper begins with a description of the methods used for the research. The observations are stated after which they are discussed with concluding remarks following thereafter. Briefly looking at the life cycle of malaria, it is well known that they suck human blood as a meal and in turn inject infectious sporozoite stage parasites into people. These sporozoite stage plasmodia enter into the blood circulation and migrate to the liver. In the liver, they invade liver cells and go through replications differentiating into merozoites. The merozoites invade and enter vulnerable...
3 Pages(750 words)Research Paper

Product Life Cycle

...Introduction A product life cycle analysis by Arthur D. Little was commissioned by Procter and Gamble (P&G) whose main objective was comparison of disposable diapers with reusable diapers. The analysis was particularly interested in resource usage of raw materials, water, environmental releases in such forms as air, water and solid emissions, and energy. The moment the comparative environmental burdens of every diapering method is well understood, various recommendations aimed at minimizing overall environmental burden can be planned and implemented ,most likely adding or catalyzing formation of appropriate public policy pertaining to management of solid waste within the jurisdiction. 1. Assumptions of...
3 Pages(750 words)Assignment
sponsored ads
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.

Let us find you another Essay on topic U10a2 Life Cycle of the Stars Paper for FREE!

Contact Us