GEOL 1001 Chapter : Geology
Document Summary
An evolving image of earth: the ancients thought the universe was geocentric, heavenly bodies circle around a motionless central earth, proven by ptolemy (100-170 c. e. Contracting: the doppler effect permits us to detect star motion. Nuceosynthesis: stars are truly element factories , big bang nucleosynthesis formed lighter elements. According to the geocentric model of the universe : the earth lies at the center of the universe. A light year represents : the distance that light travels in one year. The key evidence that the universe is expanding is: the red shift of light from distant galaxies. According to the big-bang theory : everything that now comprises the universe started at a single point about 13 billion years ago. Accumulations of dust and ice into masses that range from basketball-sized to a few kilometers across are : planetesimals. The carbon atoms that now form your body (and the other heavier elements from carbon to iron) : formed by stellar nucleosynthesis.
