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essay of the life cycle of a star
essay of the life cycle of a star
essay of the life cycle of a star
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Elements are often referred to as the building blocks of matter, combining to create not only life but everything surrounding it. However, these elements are not created on their own. They are forged deep within the cores of massive balls of gas dispersed throughout the universe and blasted through the vastness of space in their immense, self destructive explosions. Stars, through their violent birth to their even more violent death, manufacture the elements necessary for life. These giant balls of superheated gas begin their lives as nebulas, slowly evolving into the magnificent lights we see burning in the night sky and eventually dying by gravity, the same force that helped create them, scattering the plethora of elements they created across the universe, allowing life as we know it to occur. Stars are the source of human existence and life on Earth because through their life cycles, they create the basic elements necessary for life to occur and thrive.
Stars are born using the ingredients of hydrogen and gravity. Nebulae, clouds of stardust and gas, are “star nurseries where m...
Have you ever heard the phrase “We are stardust”? Chances are you have, but what exactly does that mean? As an Astronomy major and someone whose always been fascinated by the wonders of space, including the wonder of supernovas. I want to pass some of the information I have learned to you today by telling you the different types of supernova and what happens during a supernova.
The Sun is a huge, bright sphere that is mostly made up of gas that is about 5 billion years old. The Sun is the closest to the Earth, it is 145 million km distant (this distance is called an Astronomical Unit). The next closest star is 300,000 times further away. There are probably millions of similar stars in the Milky Way galaxy (and even more galaxies in the Universe), but the Sun is the most important to us because it supports life on Earth.
Yes, Moritz mentions that after the first generation of stars produced all the elements heavier than helium and hydrogen subsequence the generation of stars formed out of material enriched with these heavier elements. (Science and Religion Page. 122) Moritz concludes that combined of these chemical elements' events the planet Earth to become a cosmic sanctuary for biological life (Science and Religion Page. 122).
Stars form by starting in a nebula, which is a cloud of interstellar hydrogen gas and dust and are born in cold, and dense clouds of gas which the pressure cannot resist gravitational contraction. The gas and dust compress due to gravitational forces, forming a slowly rotating globule. The globule is cooled by emitting radio waves and infrared radiation. It is compressed by gravitational forces and by shock waves of pressure from supernova or the hot gas released from nearby stars. These forces cause the roughly spherical globule to collapse and rotate and take a process of collapse from between 10,000 to 1,000,000 years. Gravitational forces overcome gas pressure and the globule collapses and the cooling occurs and its spin increases.
Our Sun continuously converts hydrogen into helium and with this process it provides the essentials for life processes. In doing this it controls “our climate, provides light, raises tides, and drives the food chain” (Schaefer 34). Our Sun also has influenced many beliefs now and in the past. History has documented Sun worshipping religions while many current societies use solar calendars (Schaefer 34).
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.
The poet John Keats, who writes “Bright Star” and the poet Robert Frost, who wrote “Choose Something Like a Star” both share a common writing style which is shown through the similarity in the theme, structure and other poetic devices in their poems.
Star, large celestial body composed of gravitationally contained hot gases emitting electromagnetic radiation, especially light, as a result of nuclear reactions inside the star. The sun is a star. With the sole exception of the sun, the stars appear to be fixed, maintaining the same pattern in the skies year after year. In fact the stars are in rapid motion, but their distances are so great that their relative changes in position become apparent only over the centuries.
The formation and evolution of the Milky Way galaxy come, on one side, from observations concerning chemical abundances in stars and gas and, on the other side, from the continuous improvement of stellar nucleosynthesis calculations (Chiappini et al, 2001). There are some important quantities relevant to the chemical evolution of the Milky Way, such as the star formation rate (SFR), the initial mass function (IMF), and gas is still poorly constrained. However, a good model of chemical evolution can allow us to impose constraints on such quantities (Chiappini et al, 2001). In particular, a good chemical evolution model should be able to reproduce observables larger in number than the number of adopted free parameters. Among the observables, there are in the center with the consequent formation of the bulge. During the second episode, a much slower infall of primordial gas gives rise to the disk with the gas accumulating faster in the inner than in the outer regions. (Chiappini et al, 2001). In this scenario, the formation of the halo and disk are almost completely dissociated although some halo gas falls into the disk. This mechanism for disk formation is known as “inside-out II scenario, and it is quite successful in reproducing the main features of the Milky Way (CMG97) as well as of external galaxies especially concerning abundance gradients” (Chiappini et al, 2001).
Nebula away so that it can avoid certain things. In the short story, “The Star,” the priest stated,
When first discovered, lasers were thought to be the ‘cure all’ for modern scientific problems. Although many limitations have been realized, lasers are slowly improving many different aspects of our lives. From eye surgery to industrial precision cutting and fabrication to medical marvels like tattoo removal, surgery, and even destroying isolated cancer cells, lasers continue to be a behind-the-scenes tool for improving our lives. Many people have heard of the lasers, but few know that the term is actually an acronym for Light Amplification by the Stimulated Emission of Radiation. Even still, fewer could explain how a laser works.
Shklovskii, Iosif S. Stars: Their Birth, Life, and Death. Moscow: Central Press for Literature in Physics and Mathematics, 1975.
The sites of star formation in the galaxy are mostly located within molecular clouds – expansive, cool clouds of mostly hydrogen and helium gas. Molecular clouds are on average too diffuse to contract gravitationally, but within a cloud are regions of locally higher density, which are the sites of active star formation. It is not known exactly what causes molecular clouds and star-forming regions to be distributed as they are. However, it appears to be related to the spiral-arm structure of spiral galaxies, which is thought to be the result of density waves passing through the disk, compressing matter and igniting star formation in their wake, leaving the trails of young, hot, blue stars in their wake that are the primary feature of spiral galaxies.
A star is an orb made up of hydrogen and helium. Stars are formed when a gravitational disturbance, such as galaxies colliding or a supernova explosion, causes molecular gas clouds to collapse. The concentration of gases generates heat and momentum from particle movement in the cloud produces a spinning effect. After approximately one hundred million years, core temperature and pressure reach levels that are sufficient to ignite nuclear fusion, which is what defines a star. A star’s properties are determined by its mass. Red dwarf stars, the least massive, use small amounts of energy over a very long period of time and scientists estimate that they can live for ten trillion years. The most massive stars, Supergiants, may live only a few million years. Most stars, including the Sun, are in the main sequence phase of their existence (Cain, 2009).
One of the most commonly explanations from a scientific old-earth viewpoint is known as nebular hypothesis. This hypothesis is developed