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Module 1.1

by: Morgan Oestmann

Module 1.1 ASTRO103

Morgan Oestmann

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About this Document

Scale and Contents of the Universe
Introductory Astronomy
Michael Sibbernsen
75 ?




Popular in Introductory Astronomy

Popular in Astronomy

This 3 page Bundle was uploaded by Morgan Oestmann on Monday February 22, 2016. The Bundle belongs to ASTRO103 at University of Nebraska Lincoln taught by Michael Sibbernsen in Spring 2016. Since its upload, it has received 30 views. For similar materials see Introductory Astronomy in Astronomy at University of Nebraska Lincoln.


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Date Created: 02/22/16
Scale and Contents of the Universe  Scientific Notation 16 o 41,000,000,000,000,000 = 4.1 x 10  Metric Prefixes o Peta (P) 10 15 o Tera (T) 10 12 9 o Giga (G) 10 o Mega (M) 10 6 o Kilo (k) 10 3 -2 o Centi (c) 10 -3 o Milli (m) 10 o Micro (u) 10 -6 o Nano (n) 10 -9 -12 o Pico (p) 10 o Femto (f) 10 -15 o 41,000,000,000,000,000 = 41Pm  Astronomical Unit- aver11e distance from the earth to the sun o 1 AU= 1.5 x 10 m  Light year—distance that light travels in one year 15 o 1 LY=9.46 x 10  Parsec-distance at which one astronomical unit subtends an angle of 1 arcsec (1/3600 of a degree) (Uses the prefixes) 16 o 1 pc = 3.09 x 10 o 1 pc = 3.26 LY o 1 pc = 206,265 AU  Sun takes 99% of our galaxies mass  Solar System o Terrestrial Planets (Earth like)  Mercury  Venus  Earth  Mars o Jovian Planets (Gassy surface)  Jupiter  Saturn  Uranus  Neptune  Radius of our Solar System o 40 AU For Planets o 100 AU  Kuiper Belt o 50,000 AU  Oort cloud  Nearby Stars o Alpha Centauri  4.3 LY or 1.2 pc o Sun in one of ~100,000,000,000 o Cannot actually get images of our Milky Way  Thickness of the Milky Way o 1 kpc  Magellanic Clouds o Large and Small Clouds of Magellan o Orbital galaxies around Milky Way  Local Group o 30-40 Galaxies o Gravitationally bound  Super clusters o Conglomeration of groups of galaxies o We are a part of the Local Group Super cluster  Universe o Visible or observable universe o Most images makes you believe that there is a middle or edges but that isn’t true o ~100 billion galaxies in the universe o Milky Way has 100 billion stars o 1 x 10 Stars in the universe  Hubble Deep Field Image o Taken in 10 dayth repeated pictures o Image is 1/30 of the diameter of the moon o 1,500 galaxies seen  Speed of Light o C= 3.0 x 10 meters/second o Galaxies that is a million light years away, it has taken the light a million years to get here o Earth’s Circumference =1/7 of a second o Earth  moon =1.25 seconds o Sun  Earth =8.3 minutes o Across solar system =9.3 hours o Sun  nearest star (Proxima Centauri) =4.2 years o Across the galaxy =100,000 years o Milky Way  Andromeda Galaxy = 2.5 million years o Radius of the observable universe = 13.7 million years  Address o Morgan Oestmann o 3718 NW 52 ndSt o Lincoln, NE 68524 o United States of America o Earth o Terran Solar System o Orion Spiral Arm o Milky Way Galaxy o Local Group o Local Super Cluster o Universe


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