Introduction to Astronomy Essay Example for Free

Introduction to Astronomy Essay The life cycle of a star is a process that is not only beautiful but, fascinating to those fortunate ones who have the chance to study the subject. To the uneducated soul, gazing upon the night sky wondering what is out there is not a common thing. But being able to learn about what is really out there and how it became, that my friends, is truly an amazing task. One has to wonder just how we know what type of star we are looking at or at what point in the star’s life cycle the star dwells. Since the dawn of man, we have studied the stars, and until the last century, astronomers have found ways to measure four properties of stars: their luminosities, temperatures, radii, and masses. With this knowledge, they now have classified thousands of stars by plotting these stars on diagrams and charts characterized by any pair of these specific properties. A Star is Born Stellar Nursery – Nebula The proverbial birth of a star starts within a huge cloud of gas and dust known as a nebula. A nebula is approximately 21 light-years in width. When the gases and elements of the nebula start to contract due to the pull of its own gravity, it will create a protostar, which can startingly grow to roughly 60 million miles across. This is where the star begins to take shape. In order for a star to grow, it will need nuclear fusion to take place, and that requires tremendous amounts of pressure and heat. Main Sequence Stars The enormous pressure that is created compresses together elements to form more elements and to create energy. With hydrogen being the least dense and easiest to fuse, stars begin fusing hydrogen first. The side effect of this fusing of nuclei, or nuclear fusion, is the production of two positrons, two neutrinos, and the release of energy. Stars that are in the hydrogen burning process are known to be in the main sequence. Stars will spend the majority of their lifespan in the main sequence. Using the standardized classification system, astronomers find that about 90% of all stars cluster in thin bands on each the noted diagrams. Red Giant Eventually in the star’s life, the hydrogen supply in the core will begin to expire, when this happens, the sun’s core becomes unstable and will begin to contract. Consequently, the outer shell of the star, which consists mainly of hydrogen, will start to expand. During the expansion, it cools and will begin to glow red. The star now resides a red giant phase of its life cycle (Cain, 2009). Practically all stars will evolve identically up to the red giant phase, yet depending on the amount of mass a star, the next phase in the life cycle can be greatly different. Supergiants One possible evolution of extremely massive stars, although rare, is to become a supergiant. But what is a supergiant? When the radiation released by the fusion of helium into carbon it causes the red giant to expand even larger, perhaps into a star roughly 400 times the Sun’s size. The End of Days – Death of a Star White Dwarf A white dwarf, or a remnant of a star that has collapsed, are the destiny of stars like our sun. This phase in the life cycle is attained when the nuclear fuel supply is exhausted. Typically, a white dwarf can have the mass of about six-tenths the mass of our sun, but obtains size considerably smaller than that of the Earth. A white dwarf is formed when the shroud of a red giant is ejected as the core burns the last bits and pieces of its nuclear fuel. A white dwarf slowly fades into oblivion as it cools down. Supernova Possibly, exceedingly massive stars can continue to fuse heavy elements in order to produce more energy. Nevertheless, once iron is formed, it cannot be fused to make more energy. This is because iron has such a high binding energy and is thus very stable. Due to the immense gravity, the core will collapse and huge amounts of gas on the surface will blast out into space. This phase in the star’s life cycle has now become a supernova. Neutron Star Following a supernova explosion, the iron core of the star may be enormously massive, and may have an immense force of gravity. It has now become a neutron star, where the negative force, or pushing effect, between neutrons stops the contraction caused by gravity. Pulsar It is possible for a neutron star to spin rapidly following a supernova explosion. A result of this spinning, the neutron star may send out two beams of radio waves, light, and X-rays. These beams radiate in a circle as the star is spinning, and thus appears that the light from the star is pulsing intermittently. This is why it is called a Pulsar. Blackhole Yet some extremely massive supergiants, many with a mass more than four times that of our own Sun, may continue contracting until their nuclei are compacted into even more dense matter. The compacting matter forms a body so dense that it forms a black hole. A black hole is an extremely massive and dense, spectral body with a gravitational pull powerful enough to prevent the escape of light (Newman, 2002). Life as We Know It Astronomers believe Earth and all its living organisms are composed of elements formed in the interiors of stars, especially supergiants that exploded as supernovas. As astronomers across the globe scour planetary systems, both within and beyond our galaxy, in the quest to find life, they are centering their attention on each systems habitable zone. The habitable zone is where heat radiated from the star is just right to keep a planets water in liquid form (Williams Pollard, 2000), the sweet spot of the solar system.

Free Narrative Essays - Voices :: Example Personal Narratives

   Voices    The Voice: Well, Mrs. Dryer, I go to a very competitive school. I have to take competitive classes. It's not as though the work load would go down if I dropped to a lower level. I had a very busy week, and the play just started. I'll have more time this week. I promise to practice more between now and next lesson.    The Scholar (that lives in my mind): What is that woman saying!? Drop my AP classes so that I'll have more time for piano? Does she realize that piano isn't life? Or at least not my life? I've taken ten years of music, I think that's enough. I'd rather be spending my time becoming a more prolific writer. That's were my passion lies, not in music. Music is just romanticized math. It doesn't say anything deeper than its title. Not anything specific, at least.    The Musician(that lives in my mind): Ummmm...excuse me?    The Scholar: You heard what I said. Everyone gets sick of a song after awhile. It's because there are no life issues in music. You hear it and it's over, and there's nothing to hold on to, nothing to cherish, not even an image, afterwards. It distracts me from reading. Yes, it's part of culture, but to really appreciate it you have to have an ear for it. It's not my thing. To really get it, it has to be your thing.    The Musician: Not your thing? Honey, listen to me, music is most definitely your thing. You can't escape it. As the volume goes up, your soul goes under, submerged in tone and rhythm and rubato (if you're lucky). It takes over your breath.    The Scholar: I think that's more a function of sound wave vibration than anything else.    The Musician: No, think of it this way. When we play gently we aren't gentle with the keys. We are gentle in the sound. But how do we get that sound? How do we know instinctively, or at least after practice, that a certain touch produces dolce? The key is breath, is mind. It's in us, not the music. No formula of physics could ever produce that type of sound.

Cebuano Dialect

Rationale: The Cebuano language is widely spoken in the Philippines. It is the primary language of approximately 15 million people living in the central part of the country. The Cebuano people have been using a single dialect but with different accent, pronunciation, meaning, and the way they deliver it. Cebuano is the language spoken in the provinces of Cebu, Negros Oriental, Bohol, Southern Leyte and Southern Masbate. The purpose of this study is to distinguish the variations and difference of our own Cebuano Dialect.Before the Spaniards and other Europeans came to the Visayas, there was no word or place called Cebu and no language was called Cebuano. There was a town named Sugbo and the Spaniards hispanized the name into Cebu and Cebuano to refer to the people and language spoken in Sugbo and adjacent areas has one dialect and that is Cebuano-Bisaya. Yet, we come into a point that the Language itself varies in different ways from grammar, pronunciation and its word meaning. TABLES AND FINDINGS Place: Aloguinsan, Cebu. Southern Part of Cebu City) Respondents 2 young adults Name:Saniel Gagarani age:19 years old Occupation: Farmer Pila naman ka years nag uma? Answer: Tagutlo na ka tuig ang milabay. Tagpila diay ang sako sa Humay? Answer: Tagpira? Tag Otso sintos ang sako sa wala pa gi galling. Name: Alferdo DumaguitAge: 17 years oldOccupation: Uneducated/Bystanders Ngano wala man ka ni tiwas pag skuela? Answer: Kay apiki man mi sa kwarta. Na paka plano mu balik pag skuela?Answer: Naa pa, pero nag agad pa ko nga mahusay mi. 2 elderly Name: Paterno MahinayAge:32years old Occupation: Farmer Dugay namo nag puyo dri dapita? Answer: Oo, na libud na namo ang tibuok South og diri rami napahimutang. Kanus-a man mo nakabalik sa syudad? Answer: Makadto ako Cebu hagbay na mga napulo na ka tuig milabay. Name: Agustino Campana Age: 52years old Occupation: Barangay tanod. Dugay na ka nag tanod kuya? Answer: Tiod-tiod na pud. Mao mani ako panginabuhi. Asa diay imo asawa kuya?A na man ang mga tao single daw ka? Answer: Maraot man og batasan, nag bulag mi. 2 students Name: Haniel Paquibot Age: 15 years old Occupation: Student Ganahan ka mo skuela? Dili ka tapulan? Answer: Makapoy lakaw padulong sa skuelahan. Unsa naman ka gradoha? Gwapa sad imo maestro? Answer: Grade 6, Mahusay ra. Maot ug batasan. Name: Lemuel Rago Age: 12 years old Occupation: Student Nalingaw ka sa skuelahan? Answer: Makapoy sige og surat makaturogon ko. Unsa man imo masulti sa imo maestro?Buotan? Gwapa? Answer: Nakarugay ko. CONCLUSION: Therefore, Cebuano refers primarily to the inhabitants of the Province of Cebu, their descendants, and to the language they speak. It refers to both the people and the language. No one argues with this definition. Secondarily, though there are some who disagree with this, Cebuano applies to all speakers of vernaculars mutually intelligible with the vernaculars of Cebu, regardless of origin or location of the speakers, and their ancestry.However, with res pect to the structure of the dialect. There are also words that retain the /r/ in the aforementioned position yet are as popularly spoken without it. But all in all, there is yet no standard for spoken Cebuano. Having a standard language is a matter of power, acceptability and extensive usage. In each of the respective territories of Cebuano, there is a dominant variety, those in their economic and educational centers. RECOMMENDATIONS

Diseases Associated With Poverty Malaria - 1223 Words

Yujin Sung Barrett AP World History 24 March 2017 KC 6.1.3: Disease, scientific innovations, and conflict led to demographic shifts. Diseases associated with poverty: Malaria Malaria or other similar diseases like malaria has been recognized and encountered by humans for more than 4,000 years. Malaria is caused by the genus Plasmodium parasites, which enter the human body and are transmitted to people through the bite of a mosquito infected with the parasite (QA, Malaria). Once the parasite enters the human body, the parasites multiply in the liver and then infect red blood cells. The malaria parasite was first discovered on November 6, 1880, by a French army surgeon named Charles Louis Al phonse Laveran. While stationed in†¦show more content†¦Also, human population movement from higher transmission areas jeopardizes reintroduction and resurgence in malaria-free regions, and in addition has undermined elimination works in the past. For that reason, it is important to understand the patterns of parasite dispersal in order to target control by pinpointing regions where the imported infections originate from and where they play a part in transmiss ion. Globalization aided in impacting human health by population mobility. The source of epidemics throughout history can be traced back to human migration (Saker). The effects of these epidemics have changed whole societies. International efforts to prevent the spreading of infections from one country to another have been focused on. Early diseases that spread between Asia and Europe included the bubonic plague, influenzas of various types, and other similar contagious diseases. The world is more interdependent and connected than ever in the era of globalization. This is because inexpensive and efficient transportation allows access to almost everywhere and the increase of global trade of agricultural products brought an increasing number of people into contact with animal disease. Trade routes had long been established between Europe and Asia along which diseases were unintentionally transmitted. The management of malaria is a global role (Carter). Global institutions support theShow Mo reRelatedWhat Lies Within1401 Words   |  6 PagesMalaria According to the ONE CAMPAIGN approximately 219 people live in the world with malaria and 90% of those who died from malaria are from sub-Saharan Africa. There are many important risk factors that are highly associated with malaria. 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According to the World Health Organization Research, Malaria is a mosquito-borne disease caused by the parasite plasmodium (WHO, 2011). It is a life-threatening disease transmitted through