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Lectures 1, 2 and 4

by: Alexandra Torres

Lectures 1, 2 and 4 ISP205

Marketplace > Michigan State University > ISP205 > Lectures 1 2 and 4
Alexandra Torres
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I could not take notes on lecture 3. Read chapter two of the book for clarifications on that class.
Visions of the Universe
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This 4 page Class Notes was uploaded by Alexandra Torres on Wednesday January 20, 2016. The Class Notes belongs to ISP205 at Michigan State University taught by G.Voit in Winter 2016. Since its upload, it has received 71 views.

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Date Created: 01/20/16
Visions of the universe Lecture 1 Professor: Mark Voit  Office: Biomedical and Physical sciences building. Course description: An introduction to the universe. A unique perspective of life on earth.  How does science works?  What are the limits on what we can discover?  This course focuses on astronomy. Objectives: 1. Develop scientific literacy  Create knowledge to be able to discuss and show what to you know. 2. Practice scientific reasoning.  Create your opinion Rules: o Make the readings o Ask questions o Attendance is not graded, but there is a 10% participation score. o Extra credit opportunities will be available on class. Exams: o No makeup exams- Lowest grade dropped o EXAM 1: February 12 o EXAM 2: March 25 All homework will be online. Book and IClicker required Lecture 2 What is our place in the universe?  THERE ARE SEVERAL LEVELS OF STRUCTURE IN THE EARTH. (The solar system) Our galaxy is in a group of galaxies. Spiral shape collection of starts. (Milky Way)  We need to understand the levels that structure galaxies  Light travels at a finite speed.  When we look at the sun, we are seeing light that is 8 seconds ago. The speed of light is 3000.000 km/s. We have to remember that the further we look, the further we see into the past.  The universe is 14 billion years old, this means that the furthest we can see is 14 billion light years away.  The universe as a whole is much bigger than the part we can actually see.  There is a difference between what there is a whole and what we can see.  Look at the diagrams in the first five slides, they explain the distribution of the universe. (Lecture two slides)  Fact: Sirius (star) is 8 light years away. How big is the universe? 1:10,000,000,000 model: scale model The solar system Fruit example: (this is a shirked perspective) If the sun is the size of an orange, then Jupiter is the size of a grape Earth is like a 1/100 of the grape In the shrieked scale model the nearest star from earth would be from the desk in class where the orange is sitting to the state of California.  The nearest star system is alpha Centauri A, Alpha Centauri B, and Proxima Centauri There are at least 100 billion galaxies A big galaxy contains around 100 billion starts Grains of sand and the galaxy. How did we become to be? The Big Band Theory  How does the big bang works? The big bang created matter and gravity pulled that matter into galaxies. Galaxies then created starts by pulling matter together and creating nuclear fusion, Hydrogen and Helium are the two basic elements that created the elements on stars. This elements on starts created new basic elements that created life. Finally, planets like ours were created and now we exist. How do our lifetimes compare with the age of the universe? The history of the universe in terms of a calendar. (Check dates on D2L slides)  It is 14 billion years of cosmic history  First came the big bang  Then, the Milky Way (our galaxy) was created  The earth created  Then, there was life on earth  Then, complex life forms appeared  Then dinosaurs appeared  Dinosaurs where extinct  Then, humans appeared.  Human important historical events  Your birth  Your first day at MSU  Today How does earth move in space? Our sun orbits once per year at 1000,000 km/h Starts also move around randomly. If we look as a milky way as a whole, all the starts in it also move and orbit. How does galaxies move? When we talk about expansion of the universe, we talk about galaxies going further apart. How long did it take for those galaxies to achieve their position? About 14 billion years. We look to expansion to know how old is the universe. Lecture 4 Review: The celestial sphere and the ecliptic. Understand the map of the universe, check diagrams on chapter two of the book. The moon passes through a cycle takes 29. 5 days. Actually, the word month comes from the word “moon”.


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