Investigation of Dark Matter

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Investigation of Dark Matter Introduction Throughout the years, scientists have been looking for the missing mass of the universe; it has yet remained an unsolved mystery. Using different methods, scientists have tried to determine the mass of the universe and surprisingly found a discrepancy suggesting that ninety percent of the mass of the universe is nowhere to be found. Then here comes the term “dark matter”, referring to this unfound matter of the universe. It is called dark because it gives off no light and matter because it has to have some mass to be able to explain the effects that they produce. There have been different perspectives about dark matter. Some scientists think that dark matter is in the form of black holes, very massive objects floating around in the universe still unseen. While there are some that believe that dark matter are subatomic particles that never or seldom interact with matter. So how did the matter over dark matter come about? Before we will be able to tackle the issue of the theory of dark matter, when, why, and how it existed, let us first study the evolution of the different studies of the universe. Ptolemy and the Solar System ============================ Long time ago, scientists believed that the sun revolved around the earth, they all agreed with the scientist Ptolemy’s explanation that the earth was like a stationary globe where other seven planets revolved around it. Ptolemy’s seven planets were: the moon, the sun, Mercury, Venus, Mars, Jupiter, and Saturn. The Almagest explains Ptolemy’s work. Ptolemy’s model explained the circling motion of the planets with the star... ... middle of paper ... ...nough to pull itself back in. It is said that the critical density of a flat universe is 1. Without dark matter, the critical density of our universe will be somewhat between 0.1 and 0.01, and that would be an open universe. If there is too much dark matter, then we must have a closed universe. With the right amount of dark matter, we will stay as a flat universe. Therefore, this means that the amount of dark matter will determine what will be the end of our universe (Miller,1995). References: “Dark Matter”.2005. 6 May 2005 Hagan, David. “Dark Matter Study Guide.”2003. Science Museum of Virginia. 6 May 2005. Miller, Chris. “Cosmic Hide and Seek: The Search for the Missing Mass.”1995.6 May 2005
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