Wk2 P3.docx - Our Solar System Miranda SimmonsJanuary 18,...

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Our Solar System Miranda SimmonsJanuary 18, 2011 case study As far as we know, there are nine planets locked in orbit around  the Sun. Only one, our own Earth, supports life. But there are  countless other suns throughout countless galaxies scattered across  the expanse of the universe. We still don’t know if life exists on  another planet in some other galaxy.  During the past 15 years, space probes such as the  Mariner   and   Voyager   missions   have   given   us  tremendous detail about all the planets in this system.  From the Center of the Universe to the Edge of a Galaxy  All of the ancient peoples regarded the Earth as the center of the  universe (a  geocentric  perspective), motionless under a canopy of  stars that circle from east to west. The planets were perplexing to  the ancients because they appeared to wander among the stars.  1
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Wk2 P3.docx - Our Solar System Miranda SimmonsJanuary 18,...

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