AST 1002 Study Guide - Midterm Guide: Spectroscopy, Diffraction, Elementary Particle
8 Apr 2016
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Document Summary
70 sexillion stars in the universe (so far) Speed of light the fastest speed possible, speed at which light travels (186,000 m/s) The sun is 1 au from earth (8. 2 light minutes) Au (astronomical unit) semimajor axis of earth"s orbit around the sun, the average distance between the earth and the sun (93,000,000 miles) The sun is 109 imes larger than earth. The moon is 238,900 miles from earth. Used for navigaion, imekeeping, locaing celesial objects, and mythologies. Most stars are unrelated and lie at diferent distances, but seem equally distant. Celesial sphere canopy of earth surrounding earth"s stars. Fixed paterns move across the sky because the earth rotates once per day. Stars appear to rotate around the north celesial sphere. The sun appears to shit ~1 /day relaive to its background because earth orbits 1 /day. Caused by a 22. 5 ilt on earth"s axis.
