ch1.2 - About Mastering Astronomy Set clicker frequency to...

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Unformatted text preview: About Mastering Astronomy Set clicker frequency to CC 1. Press the power button until the blue light flashes 2. Press CC http://www.masteringastronomy.com Tuesday, September 6, 2011 To log into MA, type in your new login name and password. Tuesday, September 6, 2011 If you haven’t set up an account yet, click New Students. If you have not already registered, please refer to the directions posted on Angel > Materials > Course Handouts > Course Packet Tuesday, September 6, 2011 Use your full MSU email as a Student ID (with the “@msu.edu”) Course ID: MSUDonahue2011 Tuesday, September 6, 2011 Welcome to the MA site. Links on the top bar take you to different activities and resources. Tuesday, September 6, 2011 Anything you do in the “study area” is completely private. None of your activities in the “study area” are reported to me. Tuesday, September 6, 2011 To start submitting homework, get to our class assignments by clicking “Assignments”. Tuesday, September 6, 2011 Click an assignment title to begin. Click on Introduction to MasteringAstronomy Tuesday, September 6, 2011 Click a task title to start. Tuesday, September 6, 2011 Be sure to click “submit” for each problem part! “Continue” takes you to the next task; “See Score…” shows you how you did.You need to complete the task to have a score. Tuesday, September 6, 2011 Tutorials are a little different. Let’s look at the “Scale of the Universe” tutorial, in “Introduction …” Remember:You have to pass through this page by way of the “Assignment” link. If you do the tutorials through the “Study Area” link, your scores will not be reported. Tuesday, September 6, 2011 After clicking the title you come to this page. Click “launch tutorial” to begin. Tuesday, September 6, 2011 Tutorials include several lessons. You earn points for completing each lesson. Tuesday, September 6, 2011 Most tutorial lessons include interactive tools to help you answer questions. Using the tools will reduce your need to guess. In the Lessons, completion (not performance) is recoreded. Tuesday, September 6, 2011 Tutorials include a series of end-of-lesson exercises. These are not optional. You earn points on exercises by answering questions correctly the first time. Tuesday, September 6, 2011 Some end-of-lesson exercises also include interactive tools to help in answering questions. Exercises are graded based on your FIRST guess. Tuesday, September 6, 2011 When you are ready to quit, click the “S” button to Save your work.You may have to open the pop-up window a little wider to see it. Tuesday, September 6, 2011 Quitting without pressing the “S” will lose all your work. Clicking out of the pop-up box may lose all your work. Keep track of what you’ve done if you click “S” before you’re finished: the program will remember but will not remind you. is your friend. Tuesday, September 6, 2011 You will see a results page. This student still needs to complete much of the tutorial and should go back, by launching the tutorial. Tuesday, September 6, 2011 This student is ready to submit results. Remember, the “Exercises” are not optional - they are 50% of the grade. Tuesday, September 6, 2011 You’re now back to this page. You have one more Submit step. Click this “submit” button.You can only submit once. If it is grey you have already pressed it AND you have dismissed the warning box about only having one chance. Tuesday, September 6, 2011 Be a good scientist: Double check to see your score is recorded: Click either place to see your score Tuesday, September 6, 2011 You’ve successfully submitted your results when you see this page. If you like, offer some feedback on the activity you just completed. Tuesday, September 6, 2011 Sizes, Distances and Motions in the Universe 1. Use the ten-billion to one scale to help comprehend the relative sizes and distances in the universe. 2. Use the “Cosmic Calendar” to put the history of the universe into perspective. 3. Have a mental model for how the Earth is moving through the universe. Tuesday, September 6, 2011 10 10 : 1 Scale Models Divide the REAL length by 1010 to get the SCALE MODEL distance in the same length units. Tuesday, September 6, 2011 How far is the nearest star? • Let’s view it to scale 1:1010 – Sun is the size of a large grapefruit (13.9 cm) – Earth is the size of a tiny pebble, 15 meters away. Relative_dist_nearest_stars Tuesday, September 6, 2011 The Hubble Space Telescope is 600 km above the Earth. Tuesday, September 6, 2011 How large is the Milky Way Galaxy? The Milky Way has about 100 billion stars, and is 100,000 light-years in diameter. On the same ten billion-to-one scale…. Size of the milky way Tuesday, September 6, 2011 How large is the Universe? The Milky Way is one of about 100 billion galaxies. 1011 stars/galaxy x 1011 galaxies = 1022 stars How big is 1022? Tuesday, September 6, 2011 How old is the Universe? • The Cosmic Calendar – if the entire age of the Universe were one calendar year – one month would be 1.2 billion real years All of recorded human history is in the last 30 seconds. You were born about 0.05 seconds before midnight, Dec. 31. Tuesday, September 6, 2011 Math Skills About how many days in a month? 1.2 billion in scientific notation is: 1.2 x 109 yrs 3 x 101 30 = 3 x 101 1.2 x 109 1.2 x 109-1 yrs = 3 =0.4 x 108 yrs = 4 x 107 yrs Tuesday, September 6, 2011 How is Earth moving in our solar system? Tuesday, September 6, 2011 Earth rotates once per day (counterclockwise as viewed from above North Pole) Tuesday, September 6, 2011 Earth orbits Sun once per year at over 100,000 km/hr (counterclockwise as viewed from above North Pole) Earth’s orbit is in the ecliptic plane Tuesday, September 6, 2011 “Rule” of solar system rotation and orbits • Almost everything in the solar system rotates and orbits counterclockwise, viewed from the north. – Earth, Sun – Moon around Earth – planets around Sun Tuesday, September 6, 2011 North How is our solar system moving in the Milky Way Galaxy? Tuesday, September 6, 2011 Sun and all the stars in its neighborhood orbit the Milky Way galaxy once every 230 million years, at a distance of about 28,000 lightyears from the center Tuesday, September 6, 2011 How do galaxies move within the universe? Tuesday, September 6, 2011 Galaxies move with the expansion of the Universe! • Almost all galaxies appear to be moving away from us. • The farther away they are, the faster they are moving away. • The age estimate for the universe comes from measuring the expansion: the faster the expansion, the younger the Study Interactive Figure on Mastering Astronomy universe. Area Tuesday, September 6, 2011 The 1-D Universe Does not expand from one point. The space between all points gets larger. The larger the separation between any two points, the faster the speed of recession. Every point is receding from every other point: no “center” point, no “special point”. No CENTER! Same deal for the 3-D expanding Universe…! Tuesday, September 6, 2011 Work due Thursday: Read Ch. 2 If you did not Register your I-clicker transmitter today, register it from the Angel lessons page or wait until class next week. http://www.masteringastronomy.com Thursday: Reading Review for Chapter 2 Tuesday, September 6, 2011 ...
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