The Life Cycle of the Stars

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The Life Cycle    


The Life Cycle of the Stars



Science 101


September 03, 2007

The Life Cycle of the Stars

Stars come in many definitions and in many forms today, there are Rock Stars, Movie Stars, There is even star shaped cereal for children but the most important stars we have our in our solar system. Let us look at the stars in the sky and space, their origins of birth, their features of life, and their features in death.

Light is an important part of a stars life, because light is what a star emits and makes it visible to us. Through the study of starlight, the discovery the Earth orbits the sun appeared. In addition, the aberrations of starlight eventually lead to the discovery of stellar parallax in 1838. There are many forms of photons and electromagnetic waves and because of the various forms and shapes, we are able to study star by the light that they emit.

         In the Hierarchy of the universe, stars play an important role. They are huge bodies that have come into being from great clouds of light elements, either with the stars forming simultaneously, or in later evolution of the galaxies. When a star is born out of enormous clouds of gas and dust, they come together into a gigantic ball. Then there is the pressure from all the gas and dust banging into each other and it can reach millions of degrees in temperature. The from this temperature come a life spawn out of an environment of nuclear fashion and it omits light and thus a star is born. The way that a star and our sun produce light is through the process of nuclear fusion. Einstein’s theory of relativity, E-mc squared, has proven this. The makeup and chemical composition is very closely the same from star to star. There are differences in a star’s mass, and through what phase of their life they are passing.

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There are three main groups of stars. Low mass stars, they are born with less than two times the mass of our sun. Intermediate stars, which are about 8 time the size and mass of our sun. Finally, there are high mass stars that are larger than 8 times the size ad solar mass of our sun. The formation of a star starts from a cloud of matter that forms a proto-stellar disk, similar to the way our solar system developed. The proto-star is much like a star but its central temperature is not quite hot enough for fusion. Once ...

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Quality of writing - Is the writing accurate in terms of spelling, grammar and punctuation? Has the writer used technical terms expected at this level of qualification? To what extent does the writer follow conventions and expectations for written work at this level? Grammar and spelling was good. However, the only thing that the writer could have avoided is trying to be trivial in the introduction and ending paragraph by talking about "Rock Stars" and "Film Stars".

Level of analysis - To what extent does the writer show appropriate analytical skills for this level of qualification? Have they made evaluative judgements using suitable evidence? Have these examples been developed throughout the response and has an appropriate conclusion been reached? The language that the writer used within their essay was of a high standard. They used the correct scientific language, especially when naming each stage of the life cycle correctly and explain the significance of each stage. The information is mainly accurate, although again the main point that they could have analysed more was the point on nuclear reactions, mainly because it plays a massive part in the life cycle of stars.

Response to question - To what extent has the student answered the set question? How explicit is their response? The writer has approached the question well, where they used information that could potentially be very complex and broken it down for people to understand, without loosing any essential facts. It was good that they went through a very quick history before actually discussing the life cycle of stars. They mention nuclear fusion and Einstein's theory of relativity, but hasn't been able to link both star cycles and this very well together. What the writer could have done is briefly explain this process. It was good that the writer explained the differences between star masses and the relation to out sun. It was also good that the writer explained the similarities and differences that the life cycle of the star would have depending on its' mass and what happens to each star group as it comes towards the end of it's life and finally dies. Overall, it was a good response and a very well written essay.