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STARS By: Elizabeth Talbot Class: Earth and Space Science Period: 5 Date: November 6, 2019


The Big Bang is a theory scientists use to explain how the universe was created. The universe began as a very hot, small, and dense , with no stars, atoms, form, or structure. An element is a pure substance that is made from a single type of atom. Elements are building blocks for the rest of the matter in the world. Examples of elements are iron, oxygen, hydrogen, gold, and helium.The first elements that were formed are hydrogen and helium, and they formed because atoms left over from the Big Bang were attracted to one another and condensed into huge clouds. The pressure on the centers of these clouds heated up to millions of degrees. This led to the fusion of hydrogen into helium. Three pieces of evidence that we have for how the universe formed is the amount of hydrogen and helium in the universe is consistent, the universe is expanding and we can see it through red shift, There is radiation knows as cosmic radiation and everywhere we look in the universe which is the energy that was released after the Big Bang. Pixelast | Design and Tech


When the universe was about 200 million years old the first stars were formed. Nuclear fusion is a process where two nuclei join to form a larger nucleus, and this gives off energy. Nuclear fusion is the energy source that causes stars to shine, and hydrogen bombs to explode. Stars get their power from nuclear fusion and deep inside a star, hydrogen atoms are constantly being converted by fusion into helium atoms. Nuclear fusion is a process that generates the light and heat energy given off by the stars including the Sun. For nuclear fusion to work there needs to be high temperatures. The high temperature gives the hydrogen atoms enough energy to overcome the electrical force between the protons.9 Pixelast | Design and Tech

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Elements that are larger than iron are formed by supernova explosions. Like living organisms, stars go through cycles of birth, maturity, and death. The life cycle of a star differs, depending on the mass of the star. Higher mass star develop more quickly than lower mass stars.

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A common method that is used is to determine the composition of stars, planets, and other objects is spectroscopy. Spectroscopy is the process used by an instrument with a grating that spreads out light from an objects wavelength.

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