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Physics 160 Notes

by: Bryce Stanley

Physics 160 Notes Physics 160

Bryce Stanley
University of Louisiana at Lafayette
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About this Document

These notes are from week two of the semester.
Astronomy of the Solar System
Dr. Andy Hollerman
Class Notes
Origins, planets




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This 2 page Class Notes was uploaded by Bryce Stanley on Monday September 5, 2016. The Class Notes belongs to Physics 160 at University of Louisiana at Lafayette taught by Dr. Andy Hollerman in Fall 2016. Since its upload, it has received 3 views. For similar materials see Astronomy of the Solar System in Physics at University of Louisiana at Lafayette.

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Date Created: 09/05/16
Astronomy (Day 3) Chapter 1: A Modern View of the Universe Star­ a large, glowing ball of gas that generates heat and light through nuclear fusion Planet­ a moderately large object that orbits a star; it shines by reflected light. Planets can be  rocky, icy, and gas Moon­ a natural satellite to a planet *12 men have walked on the moon* Asteroid­ a relatively small and rocky object that orbits a star Comet­ a relatively small and icy object that orbits a star Solar system­ a star and all materials that orbits it Nebula­ an interstellar cloud of gas or dust Galaxy­ a great island of stars in space, all held together by gravity and orbiting a common  center Universe­ the sum total of all matter and energy; that is, everything within and between all  galaxies Light travels at a finite speed (300,000 km/s) Destination/Light Travel Time Moon/1 second Sun/8 minutes Sirius/8 years  Andromeda Galaxy/ 2.5 million years Light year­ distance that light travels in one year; 10 trillion kilometers (6 million miles); 1 light­ year= 3 * 10^8 m/s * 86,400 s/day * 365.25 days/year= 9.5 * 10^5 ~ 10^16 m Milky Way is one of about 100 billion galaxies Astronomy Day 4: Chapter 2: Discovering the Universe for Yourself  What does the universe look like from Earth? With the naked eye, we can see more than 2000 stars as well as the Milky Way  Why do stars rise and set? Constellation  a region of the sky (88 constellations fill the entire sky) The brightest stars in a constellation may actually be quite far away from each other. The Celestial Sphere Stars at different distances all appear to lie on the celestial sphere The ecliptic is the Sun’s apparent path through the celestial sphere 88 official constellations cover the celestial sphere The Local Sky An object’s altitude (above horizon) and direction (along horizon) specify its location in your  local sky Angular Measurements Full Circle= 360 Angular size=Physical size * 360 degrees/2πr Special Topic: How Long Is a Day? Solar Day= 24 hours Seasons are opposite in the N and S hemispheres so distance does not have a toll


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