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Stars and Galaxies. Custom Stars and Galaxies Essay Writing Service || Stars and Galaxies Essay samples, help
Introduction Based on astronomical principles and facts it is possible to conduct a study of the stars and galaxies. In so doing we can use segments of the electromagnetic spectrum to understand the diverse nature of these features. The electromagnetic spectrum is the range of frequencies possible in the electromagnetic radiations. Under it therefore we look at the visible light/radiation, the x-rays, ultra violet radiation, infrared radiation, radio waves and gamma rays among others. In the present world it is notable that the most contents or objects in the universe have substantially lost light becoming dimmer an example being the stars and galaxies. This shift in light may perhaps be as a result of the expansion of the cosmos in that as the universe undergoes expansion most galaxies get more and more separated. However this can be established by analyzing the visible light/radiation and the gamma rays radiation which is the most energetic of photons.The importance of this is that by studying the various galaxies and making an observation in its diversity and place of strength in terms of position in the electromagnetic spectrum a lot can be deduced.A galaxy is a system of stars and gas which exist in variety of sizes and shapes. Stars on the other hand can be defined as a large celestial body which is normally composed of gravitational hot gases that emit electromagnetic radiations as a result of nuclear reactions within them. They are said to be in rapid motion but then their change in position is notable over centuries. There are various types of galaxies including the elliptical, spiral and irregular. This implies that there are large and dwarf galaxies with the dwarf being most common and the large ones being a result of merger of small ones. The merger of different gas clouds is responsible for the different galaxy types (Miller 50).In understanding the variance in light of the galaxies, it is important to note that most galaxies contain central black holes which attract matter into the forming galaxies. However such action forms quasars which with time have grown as distant in that as the black holes acquired more matter from the canters of the galaxies their fuel reduced and so quieting them down. The situation can only be salvaged by interaction of galaxies. The more massive the central burge of a galaxy the more Massive its black hole and hence the nature of an active galaxy nucleus which explains the visible light of the galaxy (Chaisson 20).
From most galaxies it is notable from reports in 2010 that the gamma rays detected were gigantic and produced a flare that lasted 20 days and the degree and direction of the visible light polarization had also noted a great shift. The gamma rays and the visible light emitted always have a great connection with each other.The Other notable galaxy is the Seyfert galaxy which is a spiral galaxy and whose nucleus is bright and compact. Its outer part is not clearly seen but it has a bright nucleus which resembles a star, therefore the nucleus of the seyert looks like a quasar. The Seyfert do not emit strong radio waves but then the nucleus normally radiates so strongly over a wide range with its gamma ray emission notably at I million ev and the intensity of its peaks seen to be at 450 NM emission line. In this case therefore we realize that they are thus less luminous compared to the quasars but then brighter than normal spirals like for instance the milky way. However it is becoming increasingly notable that the brightness of these Seyferts undergoes lots of changes over short periods of time like within days due to the fact that they have black holes at their nucleus in which matter falls.
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