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Extraterrestrial Life Essay

1809 words - 8 pages

Astronomy Research and the Search for Extraterrestrial Life
The objective of this paper is to discuss life here on Earth and the possibilities of extraterrestrial life in one’s solar system. The team will describe the properties of life on Earth and explain the theories for the genesis of life, including the theory of natural selection. Members will provide a brief description of the evolution of life and include a geological timescale that describes specific eras throughout the previous three billion plus years. The team will assess the possibilities of extraterrestrial life, and results will be presented.
Describe the properties of life on Earth
Properties of life on ...view middle of the document...

Explain the theories for the genesis of life
The theory of evolution has clearly started with the traces of fossils of time and change. This theory of evolution was achieved and considered by Charles Darwin, a profound scientist. Many scientists before Darwin had made the discovery of fossils with time changes and strong evidence, and Darwin’s theory was how the species went through the change (Bennett, Donahue, Schneider, and Voit, 2009). Darwin’s theory consisted of two facts for his conclusion and they are “overproduction and struggle for survival” and “individual variation” (Bennett, Donahue, Schneider, and Voit, 2009, pg. 736). The first fact is to pass traits on to other offspring and the second fact is that the specie will start to look and act likes the specie. The first known species of looks and age were determined through DNA and domains of bacteria, archaic, and eukaryote. The older species that live near hot water and near volcanic vents are called black smokers (Bennett, Donahue, Schneider, and Voit, 2009, pg. 737).
Theory of Natural Selection
The Theory of Natural Selection basically states that only the better suited species will thrive. Charles Darwin proposed this theory after observing population variations in birds. The main idea is that when any sort of change occurs in one’s environment, only the best suited of a species will be capable of thriving and adapting to those changes, and the species that are not capable of evolving or adapting will eventually die out (AllAboutScience, 2011).
Darwin noted after his observations of the birds that birds that are within the same category of that species had slightly different traits, and those different traits made that new version of that species more suited for the current environment in which the birds resided (AllAboutScience, 2011). For instance, Darwin may have observed a slightly different beak on a select few of the birds which better enabled them to search for insects within trees or buried within the ground. Darwin’s Theory of Natural Selection states that only the better suited of the species will thrive and the less suited will die off, eventually resulting in a new and improved species. Through time that species may actually evolve into a completely different creature.
There was a group of moths that had resided in cities around the time of the industrial revolution, and the moths had to cope with pollution. The lighter-colored moths were easy prey to other animals because they stood out on dark surfaces. Darker moths were more camouflaged and were better suited to survive. Over time this resulted in the lighter-colored moth species to die off and the darker-colored moths to increase in population (AllAboutScience, 2011).
When the environment balances out changes will eventually balance out, more of the evolved species will exist and fewer of the less suited species will be present. All species have proven to be genetically...

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