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by: Megan Owren

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# AST Solar System AST 191

Marketplace > University of Kentucky > AST 191 > AST Solar System
Megan Owren
UK

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Lecture notes
COURSE
The Solar System
PROF.
Gary Ferland
TYPE
Class Notes
PAGES
3
WORDS
KARMA
Free

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This 3 page Class Notes was uploaded by Megan Owren on Saturday September 10, 2016. The Class Notes belongs to AST 191 at University of Kentucky taught by Gary Ferland in Fall 2016. Since its upload, it has received 4 views.

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Date Created: 09/10/16
Meg Owren The Solar System 30 Aug – 8 Sept 2016 Collision between Planets / Asteroids  Collision between stars  Collision between galaxies Likelihood of collision depends on:  Distance  Size  Motion speed Size compared to distance Scientific Notation - makes computation of large numbers much easier. The solar system is very isolated from other stars -space is very empty of stars -solar system is very small compared to the galaxy Deduction – start with general premise and apply to specific case  Newton’s law of gravity Induction – observe mane specific cases The Scale of the Universe  Time & distances o To “see” an object, light must first reach our eyes Light year – measure of a distance; distance light travels in one year  Distance = speed x time Radio signal also travels at the speed of light Time scale: Universe – 13.7 billion years Earth – 4.6 billion years Human civilization – 10,000 years Human life – 75 years (scale down) Uni – 1 year Civilization – 30 seconds Life - .17 seconds Motions in the Sky What is the sky? – everything above the surface of the earth Stars are all different distances  You can’t tell a distance just by looking at it  Stars in the same constellations are not physically related How to describe distances in the sky:  Altitude o Above the horizon in degrees  Direction o Along the horizon (N,S,E,W) Horizon = 0 Zenith = 90 (straight up) Meridian = divides sky into E&W Daily motions – due to earth’s rotation on its axis What determines what stars we see?  Time of day  Location on earth o Position North & South  Date  Precession Equatorial Coordinate System Yearly Motions Earth revolves around the sun Zodiac - The 12 constellations that lie along the ecliptic. Precession - direction of the earth’s axial tilt doesn’t stay constant with time (wobbles like a spinning top) The Moon 28 day orbit Phase = angle between the sun and the moon

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