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Is there life Elsewhere?

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Introduction

��ࡱ�>�� ,.����+�������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������[email protected] ��0�bjbj�2�2 ($�X�X.�������������������8� ��v�������$�R��������^^^���^�^^p��p �� ����p��0p� L� p������� �p ^��^Is there life Elsewhere? Ever since the discovery of other planets in our solar system, we humans have never given up the idea of life beyond the Earth. My previous knowledge of geology and astronomy was very limited prior to taken this class. I am now able to tackle this controversial issue. In this essay, I will discuss the origin of the main resource for life, water. Then, I will show how the planet�s climate played a major factor in maintaining water on Earth. Finally, I will be able to elaborate on the possibility of life elsewhere in the solar system. Origin of water The oceans of water characterize the Earth. Water is the primary resource needed to form life. I knew that we didn�t always have water on Earth, but I didn�t know how it originated. The first theory states that water came from inside the planet and was delivered through volcanoes in the form of gas/vapor. ...read more.

Middle

However, if we turn the Sun down to normal, the surface would stay hot because of the greenhouse effects. Therefore, the surface temperature depends on the amount of light received, the amount absorbed, the reflectivity of the surface and the greenhouse gases that retain the water vapor from escaping the atmosphere. Possibility of life Prior to taken this class, I always assumed that the most likely place where life could exist was somewhere far away from us, since those are the most unknown to us. Actually, our neighboring planets have a better chance of sustaining life since their composition and environment is more similar to ours. I also found out that explorations have indeed gone to the outer planets. On Mars, scientists know there is some water in the polar ice caps. Where there is water, there could be life. However, the water is frozen. Nevertheless, if it were to be liquid it would quickly evaporate and diffuse into the atmosphere because its weak gravity. ...read more.

Conclusion

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