ASTR1010 Lecture 2 17 Jan 13. Reading Comprehension Question. Reading Comprehension Question. Your turns. Introduce yourself to 2 neighbors

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1 ASTR1010 Lecture 2 17 Jan 13 Today Why Astronomy? One more answer The Really Big Picture Announcements: Tuesday: please install SkyGazer and bring laptop! Clickers-for-credit starts Tuesday, 22 Jan JiTT QUIZ #1 due Saturday 5pm JiTT2 due Tuesday noon MasteringAstronomy.com assignment (MA1) due Friday 5pm Access code problems? Contact me ASAP! TAKE RESPONSIBILITY. Math Review Sessions: 5-6pm Wednesday 23 Jan, 6-7 Tuesday 29 Jan in Duane D142 Your turns Introduce yourself to 2 neighbors Trade names, hometowns, interests, etc. What topics do you each most want to learn about in this class? We ll make some efforts to get to know you Reading Comprehension Question An Astronomical Unit (AU) is equal to a. The size of an atom b. The size of the earth c. The distance from the Earth to the Moon d. The distance from the Earth to the Sun e. The distance from the Sun to the nearest star Reading Comprehension Question An Astronomical Unit (AU) is equal to a. The size of an atom b. The size of the earth c. The distance from the Earth to the Moon d. The distance from the Earth to the Sun e. The distance from the Sun to the nearest star If you re buying online Reading Reminders All reading assignments & due dates are on the syllabus! Reading happens before topics are presented in class Read TCP1 for Thurs; skim TCP2 Sample Ch1 reading quiz questions: About how old is the universe? What is the ecliptic plane? Which is larger, 1 AU or 1 light-year? What s the expected workload, according to the syllabus Also, please start observing the sky and prepare to discuss what you notice

2 Reading Reminders Desire2Learn demo All reading assignments on syllabus! Reading happens before topics are presented in class Read TCP2 for Tuesday; JiTT2 Due Tuesday at 9am! Sample Ch2 reading quiz questions: What moon phase is necessary for an eclipse of the Sun? Of the Moon? What is stellar parallax? What is retrograde motion? What are circumpolar stars? Calendar Getting Started JiTT Quiz Discussion MA help Discuss with your neighbors: Should the University of Colorado offer astronomy classes even though most students will not become professional astronomers? Why or why not? Give two reasons. Spring 2013: Golden Age of Planetary Exploration?? Spacecraft in orbit around Mercury, Venus, Ceres and Saturn, the Moon* and others on their way to Jupiter and Pluto * Two Mars Rovers & three orbiters still going strong - and more coming! Extrasolar Planets discovery rate now exceeds one per day Now is the time - and Boulder is the place! Two Mars Rovers plus three orbiters and CU building the next one

3 Earth: 16! Mars Imperial Defense Grid: 22! Cassini Orbiter around Saturn Ethane lakes on Titan! Enceladus: another active world! Imaging Team headquarters in Boulder UV spectrometer built by CU!

4 And if that seems weird The Monotillation of Traxoline (attributed to Judy Lanier) It is very important that you learn about traxoline. Traxoline is a new form of zionter. It is montilled in Ceristanna. The Ceristannians gristerlate large amounts of fevon and then bracter it to quasel traxoline. Traxoline may well be one of our most lukized snezlaus in the future because of our zionter lescelidge. Directions: Answer the following questions in complete sentences. Be sure to use your best handwriting. What is traxoline? Where is traxoline montilled? How is traxoline quaselled? Why is it important to know about traxoline? there are probably planets in our galaxy, and even more moons. Bloom s Taxonomy Chapter 1 Topics Our Place in the Universe The History of Stuff (the elements) In this section you ll Become familiar with the layout of the Universe Get a sense of deep time our place in time Understand how the elements came into existence The Really Big Picture Where are we? Scale Model Solar System Powers of Ten AstronomyPlace tutorial Quiz on Big Picture Basics Where do we come from? When are we? -- The cosmic calendar Powers of Ten video Remake: Reinforces the need for scientific notation! Puts us in our place! Notice the heirarchy of structure Keep the objects in the right order! What s the ratio between the largest and smallest known scales?

5 Another take A light year is a unit of a. time b. distance c. Either, depending on context d. Neither - none of the above A light year is a unit of a. time b. distance c. Either, depending on context d. Neither - none of the above The Big Picture: Terms & Scales Put the following in order of increasing size: 1 Astronomical Unit (AU) Size of typical planet Distance to nearest galaxy Distance to moon Distance to North Star Distance to Pluto Altitude of orbiting shuttle above surface Big Picture - Clicker Question Which is largest? A: 1 Astronomical Unit (AU) B: Distance to Andromeda galaxy C: Distance to North Star D: Distance to Pluto E: Altitude of orbiting shuttle above surface Big Picture - Clicker Question Which is largest? A: 1 Astronomical Unit (AU) B: Distance to Andromeda galaxy C: Distance to North Star D: Distance to Pluto E: Altitude of orbiting shuttle above surface

6 Big Picture - Answers Answers: Altitude of orbiting shuttle Size of typical planet Distance to moon 1 Astronomical Unit (AU) Distance to Pluto Distance to North Star Distance to nearest galaxy Big Picture - Answers Answers: Altitude of orbiting shuttle (hundreds of km) Size of typical planet (thousands of km) Distance to moon (400,000 km) 1 Astronomical Unit (AU) (150 million km) Distance to Pluto (tens of AU) Distance to North Star (tens of light years) Distance to nearest galaxy (thousands of l.y.) What is our place in the universe? Universe Quick Facts # of stars in a galaxy # of galaxies in observable universe Age of universe in years 14 billion Universe Quick Facts # of stars in a galaxy # of galaxies in observable universe Age of universe in dog years Where do we come from? COSMIC RECYCLING The first (and simplest) elements were created during the Big Bang When the star dies, they are expelled into space. to form new stars and planets! More complex elements were created in stars by fusion Most of the elements in our bodies were created in the core of a star!

7 How old is the Universe?