[ASTRON 100] - Final Exam Guide - Ultimate 90 pages long Study Guide!
29 Nov 2016
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A sense of space: the sun would hold 1. 3 million earths, there are about 100 billion suns in a galaxy like our own milky. Way galaxy: astronomers can see billions of galaxies, the universe is approximately 14 billion years old. Critical concept: the speed of light is finite. Angular size = diameter of object/distance to object: measured in radians, 1 radian = 57. 3 degrees. How do we locate objects on the sky: ncp north celestial pole. Celestial sphere imagine earth is stationary, sphere is revolving around the earth. The only time the sun is in the northern sky in amherst is just after sunrise and just before sunset in the summer. Time is a dimension (a fourth dimension, fundamentally different from other 3) Time is relative (not absolute: two people traveling at different speeds experience the flow of time differently. Time may have a beginning (the big bang - unlike the spatial dimensions)
