The Life Cycle of a Star

Introduction For millenniums, stars have fascinated the human race. In medieval times, these heavenly bodies were thought to possess mystical powers and some civilizations even worshiped them. This supernatural view was caused by the lack of information on the true nature of stars. Modern science has enabled man to study stars and come up with scientific explanations of what they are and why they shine. Astronomers in the 20th century have been able to come up with a credible model of the entire life cycle of stars.Advertising We will write a custom essay sample on The Life Cycle of a Star specifically for you for only $16.05 $11/page Learn More Green and Burnell (2004) state that the life cycle of a star takes place over a timescale that appears infinitely long to human beings. Astronomers are therefore unable to study the complete life cycle of stars since the changes occur at a very slow rate to be observed. The evolutionary pattern of stars is theref ore deduced by observing their wide range at different stages of their existence. This paper will set out to provide a detailed description of the life-cycle of a star. Birth of a Star Stars are born from vast clouds of hydrogen gas and interstellar dust. This gas and dust clouds floating around in space are referred to as a nebula (NASA2010). Nebulas exist in different forms with some glowing brightly due to energizing of the gas by previously formed stars while others are dark due to the high density of hydrogen in the gas cloud. A star is formed when the gas and dust making up the nebula start to contract due to their own gravitational pull. As this matter condenses due to gravitational pull, the gas and dust begin to spin. This spinning motion causes the matter to generate heat and it forms a dull red protostar (Krumenaker, 2005). When the protostar is formed, the remaining matter of the star is still spread over a significant amount of space. The protostar keeps heating up due to the gravitational pressure until the temperature is high enough to initiate the nuclear fusion process (NASA, 2010). The minimum temperature required is about 15 million degrees Kelvin and it is achieved in the core of the protostar. The nuclear fusion process uses hydrogen as fuel to sustain the reaction and helium gas is formed from the fusion of the hydrogen nuclei. At this stage, the inward pull of gravity in the star is balanced by the outward pressure created by the heat of the nuclear fusion reaction taking place in the core of the star (Lang, 2013). Due to this balance, the star is stable and because of the nuclear fusion, considerable heat and a yellow light is emitted from the star, which is capable of shining for millions or even billions of years depending on its size. Mature and Ageing Stars The newly formed star is able to produce energy through nuclear fusion of hydrogen into helium for millions to billions of years. During the nuclear fusion process, the heavier h elium gas sinks into the core of the star. More heat is generated from this action and eventually, the hydrogen gas at the outer shell also begins to fuse (Krumenaker, 2005).Advertising Looking for essay on astronomy? Let's see if we can help you! Get your first paper with 15% OFF Learn More This fusing causes the star to swell and its brightness increases significantly. The closest star to the Earth is the Sun and scientists predict that it is at this stage of its life cycle. The brightness of a star is directly related to its mass since the greater the mass, the greater the amount of hydrogen available for use in the process of nuclear fusion. Death of a Star A star dies when its fuel (hydrogen) is used up and the nuclear fusion process can no longer occur. Without the nuclear reaction, the star lacks the outward force necessary to prevent the mass of the gas and dust from crashing down upon it and consequently, it starts to collapse upon itself (Lang, 2013). As the star ages, it continues to expand and the hydrogen gas available for fuel is used up. The star collapses under its own weight and all the matter in the core is compressed causing it to be being heated up again. At this stage, the hydrogen in the core of the star is used up and the star burns up more complex elements including carbon, nitrogen, and oxygen as fuels. The surface therefore cools down and a red giant star, which is 100 times larger than the original yellow star, is formed. From this stage, the path followed in the cycle is determined by the individual mass of a star. Path for Low Mass Stars For low mass stars, which are about the same size as the Sun, a helium fusion process begins where the helium making up the core of the star fuses into carbon. At this stage, a different heating process from the original hydrogen nuclear fusion process occurs. Al-Khalili (2012) explains that due to the compression heat, the helium atoms are forced together to make heavier elements. Wh en this occurs, the star begins to shrink and during this process, materials are ejected to form a bright planetary nebula that drifts away. The remaining core turns into a small white dwarf star, which has an extremely high temperature. The white dwarf is capable of burning for a few billion years but eventually it cools. When this happens, a black crystalline object referred to as a black dwarf is formed. Path for High Mass Stars For high-mass stars which are significantly bigger than the Sun, the carbon produced from helium fission fuses with oxygen. More complex reactions occur and eventually an iron core is formed at the center of the star. Since this iron does not fuel the nuclear fission process, the outward pressure provided by the previous nuclear process does not occur and the star collapses. The collapse leads to a supernova explosion. Green and Burnell (2004) describe a Supernova as the â€Å"explosive death of a star† (p.164). During this explosion, the star prod uces an extreme amount of energy, some of which is carried away by a rapidly expanding shell of gas. The exploding star attains a brightness of 100 million suns although this amount of energy release can only last for a short duration of time.Advertising We will write a custom essay sample on The Life Cycle of a Star specifically for you for only $16.05 $11/page Learn More For stars that are about five to ten times heavier than the sun, the supernova is followed by a collapse of the remaining core to form a neutron star or pulsar. As the name suggests, neutron stars are made up of neutrons produced from the action of the supernova on the protons and electrons previously available in the star (Krumenaker, 2005). These stars have a very high density and a small surface area since their diameter stretches for only 20km (Al-Khalili, 2012). If the neutron star exhibits rapid spinning motion, it is referred to as a pulsar. For stars that are 30 to 50 times he avier than the Sun, the explosion and supernova formation lead to the formation of a black hole. In this case, the core of the star has a very high gravitational pull that prevents protons and neutrons from combining. Due to their immense gravitational pull, black holes swallow up objects surrounding them including stars and they lead to a distortion of the space. Parker (2009) observes that the gravity of the black hole is so strong that even light is unable to escape from this pull. The only substance thing that black holes emit is radiation mostly in the form of X-rays. Conclusion This paper set out to provide an informative description of the life cycle of a star. It started with nothing but modern astronomy has made it possible for mankind to come up with a convincing sequence for the life cycle of a star. The paper has noted that all stars are formed from a nebula cloud. It has revealed that the life expectancy of stars can vary from a million to many billions of years dependi ng on their mass. A star begins to die when it runs out of hydrogen and the fusion reaction can no longer occur. The paper has also demonstrated that the death of a star is dependent on its mass. If a star is the size of the Sun, it will die off as a white dwarf while if it is significantly bigger, it will have an explosive death as a supernova. References Al-Khalili, J. (2012). Black Holes, Wormholes, and Time Machines. Boston: CRC Press.Advertising Looking for essay on astronomy? Let's see if we can help you! Get your first paper with 15% OFF Learn More Green, S.F., Burnell, J. (2004). An Introduction to the Sun and Stars. Cambridge: Cambridge University Press. Krumenaker, L. (2005). The Characteristics and the Life Cycle of Stars: An Anthology of Current Thought. NY: The Rosen Publishing Group. Lang, R.K. (2013). The Life and Death of Stars. Cambridge: Cambridge University Press. NASA. (2010). The Life Cycles of Stars: How Supernovae Are Formed. Web. Parker, K. (2009). Black Holes. London: Marshall Cavendish. This essay on The Life Cycle of a Star was written and submitted by user Edith Martin to help you with your own studies. You are free to use it for research and reference purposes in order to write your own paper; however, you must cite it accordingly. You can donate your paper here.

Essay about Football Games in College Can Be Fun for Everyone

Essay about Football Games in College Can Be Fun for Everyone Unique things to various folks, since the situation demanded. Of course one ought to be mindful whilst playing and not hurt oneself, or become involved in some injury or accident as it could be quite painful and will take lots of time to heal. There's a goal post on every side. The answer, clearly, is no, since you always have the option to put it in another gear even in the event you believe you will need to give up. Ideas, Formulas and Shortcuts for Essay about Football Games in College Please be aware that a few of these college essay examples could possibly be responding to prompts that are no longer being used. When it has to do with writing an essay about football, you may not be worried about the way it ought to be composed. These seven sample essays respond to a wide range of thought-provoking questions. Pick the most suitable essay topic. Lastly, the detail of real speech makes the scene pop. The author starts with a rather thorough story of an event or description of an individual or place. Bridget's essay is extremely strong, but there continue to be a couple little things that could be made better. Stephen's essay is quite effective. You don't need to be an NBA All-Star or maybe a normal basketball fan to become MVP here. It's a rule that's a principal characteristic of all of the Feyenoord fans, and it's a rule that the Feyenoord fans are famed for in the Netherlands. Fans are an indispensable portion of any football game. The 2 kinds of football fan. Added benefits of playing football Football is a great physical exercise. Seniors get a previous opportunity to represent themselves and their school in the bowl game that they've worked so difficult to earn. It's very difficult to predict which players will perform well in a specific gameweek. The same may not be said for college football. How to Choose Essay about Football Games in College There are many to pick from. When you make a plan, write the very first rough draft. Between each halves, there's a break for not more than a quarter hour. At first, the user won't be the outstanding charges, however, and they're able to win a very first victory on subjects of of stadiums. Essay about Football Games in College - the Story A game free of rest usually means that the team had already played that day, 1 day means they played the former day, and so forth. Moreover, it's vital to be on time. The huge pothole on Elm Street that my mother was able to hit each and every day on the best way to school would be filled-in. Imagine working all summer and only having the ability to play three games! Football is a most popular game of earth even in today's moment. Football has been part of college experiences for almost 150 decades. Football is among the most entertaining games of earth. Football has a particular place in the life span of Americans. Football has followers throughout the world, a lot of them love to practice it at all times but as it isn't always easy to discover individuals to play or the weather to accompany, we've got the most effective free games associated with FIFA video games. President Harry Truman even made a decision to attend. Who Else Wants to Learn About Essay about Football Games in College? An eleven year old youth soccer player isn't a consumer, they don't have disposable income and they aren't the family's decision maker. To find physical and mental fitness, children ought to be encouraged to play soccer along with at school. Games are crucial for health. This game has quite a good financial career, so any student interested in it can earn a superior financial career within this field. Smaller schools would likewise be in a position to reek the advantages from memoribly sells. As a student-athlete, along with developing your sport skills, you should begin considering your academic eligibility when you begin freshman year to make certain that you're qualified for the schools on your intended list. Consider the advantage, saving is an amazingly important skill that lots of young individuals don't take part in either since they do not earn enough money to create a savings account or since they don't understand the significance of saving (Anderson 1). Some folks think that a scholarship needs to be payment enough. The Fundamentals of Essay about Football Games in College That You Can Learn From Beginning Immediately There's a significant difference between them both. This enjoyable and free-flowing on-line model of snooker puts great emphasis on steady mouse movement and aggressive ball-pocketing expertise. It's an affordable game played in practically all coun tries with wonderful interest. It's an inexpensive game, played in virtually all the countries with much interest. What the In-Crowd Won't Tell You About Essay about Football Games in College It was quite a crappy and cruel game, which was played with the aim of knocking the ball when running close to the goal line. This procedure is for making a fast and usable game summary rapidly. Only centred balls will produce a score. How players perform in a particular gameweek is quite random and the algorithm may not always become such high accuracy. It's a 90-minute-long game that's played in two components of 45-45 minutes. Making plans to visit the game is an ideal method to do precisely that. If you consider the trajectory, pace and angle calculations that enter play with each shot, it's simple to view how physics plays an extremely huge role in this hugely popular worldwide sport! As soon as you have destroyed all bricks on the present level, you immediately proceed to the subsequent one.

Using Persuasive Essay Topics

Using Persuasive Essay TopicsWhen looking for persuasive essay topics, you may come across some tips and techniques that will help you make the most of your writing. Histoty to write persuasive essays is a special form of an essay about a particular event or series of events. Histoty is used to display how a particular event is part of a historical occurrence or as a series of events and illustrates the overall significance of it.The simplest form of history is using a single event as a component of a pattern in order to tell a greater story. You can use a specific event, to make an argument as to why the event is a significant part of a sequence of events. Histoty is best used in one on one conversations with one person, because the combination of their testimony and your writing will be very powerful. You can use history to get people to put their whole story into a perspective that makes it easier for you to see the whole picture.To get your message across in the best way possible , it is important to focus your focus and create essay topics that focus on a single theme. It is vital that you write topics that are not too general or too specific so that the reader gets a full sense of the subject matter that you are trying to address. Writing about one thing at a time allows you to give a detailed description and to engage your readers and make them understand your message in a different way.If you want to impress the reader, you have to make a great impression on them. Using the same type of persuasive essay topics every time you write an essay will not give you the ability to deliver the message in a unique way each time. You have to let your readers know that you care about them and that you are willing to take a second look at their point of view.The educational and informative type of essay can be a great way to make an impact on the reader, but they also require you to be creative and innovative. Your essay topic can have a more personal element to it, b ut it has to be unique to stand out from all the other essays. You have to convince the reader that you are the only person to address their issue in a unique way.You can use the types of topics that are too broad to make an impact and turn your essay into a chore. You may even find yourself writing essays about subjects that you are not familiar with, or topics that you think would be a good topic for an essay. It is a good idea to research the topic before you begin your writing so that you are not writing your way through an idea.Once you have decided on the types of persuasive essay topics that you are going to address, you have to come up with ways to make your message the most powerful it can be. The first step in being able to accomplish this is to come up with a concrete example that you can put into your thesis statement. This means that you must put some thought into your writing, which is what makes your essay unique.You should always use all of the persuasive essay topic s in order to tell your story. Not only will it give you a strong and written point, but it will make it easier for you to get the audience to see the whole picture.

Easy Essay Writing Topics

Easy Essay Writing TopicsEssay writing is fun and interesting but also fun if you can come up with ideas that would enable you to create an essay topic that is simple. This can be done by utilizing the right kind of words, the structure and the style of writing in a way that it is not too difficult to comprehend and is comprehensible for those who are taking an effort to understand what you are writing about. This can be done if you practice a lot and can make yourself understand the concept of essays.There are many simple essay writing topics that you can choose from. You can have your own ideas or you can choose from the many simple essay writing topics that have been given in most of the colleges and universities. There are even assignments that ask you to write an essay that can be simple enough for those who are taking the time to understand what you are writing about. When you study well, you can come up with easy topics that can be able to guide you on how to structure your es says and how to formulate the basic thoughts that you will be putting into your essays.One of the simplest and yet effective ways of writing an essay is through the use of the concepts of essay writing. When you study, you will find that there are two types of essays that are given in many colleges and universities. The first type of essay is usually the difficult one, as it requires you to write an essay that is easy to understand. However, there are some who would prefer this type of essay that does not require you to exert a lot of efforts in order to understand.You should never despair with the fact that you do not have enough idea on the different essay topics that you can choose from. With the invention of the internet, you can even go online to search for essays. You can even find an expert essay writer who can help you in the process of essay writing. In fact, these professional essay writers can even come up with topics that are not even that complicated but are still simpl e to comprehend.Easy topics are good for you as you do not have to exert too much effort in order to finish it. Some of the topics that are easy to understand include school-related topics such as history, current events, legal cases, literature, etc. You can even think of topics that relate to the various ideas that you have gathered during your studies such as quotations, poems, quotes, etc. You can even find easy topics which would be able to enlighten and inspire you so that you can create an interesting and meaningful topic.Using easy topics can greatly increase the ease of completing an essay and also decrease the work load. All you need to do is to find the topic and then choose the right method of writing it. For instance, you can use the computer's spell checker to check whether your topic is simple enough or complex enough.In fact, if you have a simple topic that you want to write an essay on, you can always choose the easy to understand one. In fact, you can even make use of the keyword tools to check whether or not your topic is complex enough or simple enough. In addition, you can try to put certain ideas in your essay so that it is able to shed light on the topic that you have chosen.As stated earlier, you can also choose easy topics that have been provided by the college and universities that you attended. You can also use the current times and its global issues as the basis of your essay and make sure that you are able to convey your ideas in a simple manner. All you need to do is to spend time in developing the concept of the topic and then the rest will be there for you to go over and enjoy.

Essay Topics - Choosing Your Topic and Writing Your Essay

Essay Topics - Choosing Your Topic and Writing Your EssayWriting an informational essay that covers 21 informative topics may be the easiest thing you will ever have to do. To prepare yourself for this task, here are some tips on how to do it.First of all, you must make a list of 21 informative essay topics you want to cover in your essay. In fact, there is no set criteria for choosing your topic; just a guide to follow. For example, if you have a particular topic in mind, try to search for a certain topic and see if you can find enough related resources to help you.Once you have a list of your 21 topic, gather information on them by reading books, listening to lectures, and watching online videos. If you need a little extra help, try to take courses in English or any other subject related to writing. Your college instructor or a group of teachers can help you get some ideas. But a good guide would be a newspaper.One more tip is to make a list of all your informational essay topics. By doing this, you can organize your thoughts and learn how to express your thoughts more clearly. When you have a well-organized list, it will help you think of your topic in a logical manner.You also have to check if you have included the right kind of information about the topics you are discussing in your essay. This is very important because your audience is going to read your paper just to know what you are talking about. You can't just assume they are interested in what you say so it's very important to make sure your essay topic gives them the desired information. And since you have to convey your ideas clearly, it's better if you cover more than one topic in your article.You can find additional information on the Internet about your 21 informative essay topics. However, don't just rely on the information provided by other people. Check out your assignment from the provider's website so you can confirm the accuracy of the information provided there.Finally, when writing your essay, try to think of the topic you have chosen as a whole. Don't focus just on one part only. This way, you can more easily express your ideas and give an overview of your topic.