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Chapter 1, Week 1 Notes - Modern Astronomy 113

by: Taylor Weir

Chapter 1, Week 1 Notes - Modern Astronomy 113 113-02

Marketplace > Missouri State University > Physical Science > 113-02 > Chapter 1 Week 1 Notes Modern Astronomy 113
Taylor Weir
GPA 3.9
Modern Astronomy
Peter Plavchan

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About this Document

These are my notes from the first week of Astronomy. We made it about halfway through the first chapter, and these notes go into detail on the universe and its many parts, and the concept of light-...
Modern Astronomy
Peter Plavchan
Class Notes
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This 4 page Class Notes was uploaded by Taylor Weir on Tuesday August 25, 2015. The Class Notes belongs to 113-02 at Missouri State University taught by Peter Plavchan in Summer 2015. Since its upload, it has received 42 views. For similar materials see Modern Astronomy in Physical Science at Missouri State University.


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Date Created: 08/25/15
Week of August 215 2015 Chapter 1 Our Place In The Universe The unaided human eye can only see about 6000 stars In reality there s almost 100 billion in our galaxy alone and half of them are hidden by the horizon Polaris aka quotThe North Starquot is located almost directly above the North Pole Astronomy the branch of science dedicated to the study of everything in the Universe that lies above Earth39s atmosphere Asterism patterns of bright stars Star a large glowing ball of mostly Hydrogen gas that generates heat and light through nuclear fusion at its center The Milky Way alone contains 400 billion stars Planet a moderately large object that orbits a star and it shinesis made visible by re ected light Moon Also known as a satellite an object that orbits a planet If you were to take a picture of the Earth39s Moon everyday for its entire monthly cycle and form a video you would see that it actually wobbles back and forth while orbiting and doesn39t stay in one place Asteroid a relatively small rocky object that orbits a star Approximately 2 tons of debris hit Earth everyday Comet a small icy object that orbits a star Solar system One main star and all the material orbiting it including planets and moons The Ancient Roman Empire knew that the Earth was round somehow the information got mixed up and confused along the way leading to Europeans to the belief that the Earth was at Galileo is credited for being the first to really study the stars and is the one who discovered that Earth is not the center of the universe but merely just part of something much bigger than anyone could imagine Many people during his time believed that the Milky Way was the entire universe however it wasn39t until 1929 that Hubble figured out we were not alone Nebula an interstellar cloud of hydrogen gas andor tiny smokelike particles called quotdustquot Galaxy a great island of stars in space held together by gravity and orbiting a common center Universe the sum total of all matter energy and space as a Whole the cosmos The distance between Earth its Moon could fit our entire solar system Within the space With almost 5000 extra miles to spare There are stars 3000X the diameter of Earth The Days of The Week and Their Origins Day Roman Name Latin Plane Name t Sunday SolHelios Sun Dies Solis Monday LunaSelene Moon Dies Lunae Tuesday MarsAres Mars Dies Martis Wednesd MercuriusHerm Mercu Dies ay es ry Mercurii Thursday IuppiterZeus Jupite Dies Lovis Friday VenusAphrodit Venus Dies e Veneris Saturday SaturnusKronos Saturn Dies Saturni How can we know what the universe was like in the past Key to knowing what it was like Light travels at a finite speed 300000 kms 186000 miless 670 million mph You can circle Earth 8 times in 1 second More on the Speed of Light when Relativity is discussed Destination Light travel time Moon 1 second Sun 8 minutes Sirius nearby 8 years star Andromeda 25 million Galaxy years The stars that we see at night are lightyears away the light takes years to reach us and be Visible The stars we see could be dead already We see objects as they were in the past The further away we look in distance the further back we look in time A lightyear is the distance that light can travel in one year About 10 trillion km 6 trillion miles A lightyear in NOT a unit of time Lightseconds At great distances we see objects as they were when the universe was much younger 1 light year speed of light X 1 year 150000000 km l Astronomical Unit 1 light year 63000 Astronmical Units Moon 384 million m from Earth Our Universe is approximately 14 billion lightyears in radius There are about 100 billion galaxies within that radius and 100 billion stars in each galaxy That s enough stars to take the place of every dry grain of sand on every one of Earth


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