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Reminder and Announcement Reminder and Announcement • Classroom changed! Watanabe 415 • Mastering Astronomy HW0 due this Friday • Mastering Astronomy HW1 is available today, due next Tuesday • Come talk to Nick or Chao-Ling after class if you have any question about Mastering Astronomy What we learned yesterday • Idea about Science and Astronomy • a bit useful math for Astronomy • relative size and distance of Earth, Moon and the Sun What are we going to learn today • Build some idea about scales of Astronomical objects • How do we describe the size/distance scale of these objects OUR PLACE IN THE UNIVERSE? What is our Cosmic Address? Our place in the Universe? Class Action! Your friends, Roy and Mike, rulers of Omicron Persei 8, want to send you a postcard via the Cosmic Postal Service. The CPS is very strict about complete addresses on all mail! Help them by using all seven of the terms in the box to complete your cosmic address — put them in order, from smallest to largest: Our place in the Universe? Do this yourselves (no discussion) Write down your answers on the worksheet complete your cosmic address — put them in order, from smallest to largest: Dear Friend, Earth We hear that you are taking astronomy this semester, eh? Just The Local Group TO: keep your telescopes pointed away The Milky Way your name: __________________________ from Perseus!! Heh, just kidding. your street: __________________________ We just got back from a quick trip The Orion Arm your city: __________________________ up the Perseus Arm to the Bulge — your state: __________________________ The Solar System we saw some gorgeous nebulae along your country: __________________________ the way. The Universe ____________________________ Things here on omicron Per 8 are the ____________________________ The Virgo Supercluster same as usual - 200˚C and lots of ____________________________ hydrocarbon haze. At least we’re ____________________________ getting stellar panels installed next ____________________________ month to help lower our energy bill! ____________________________ Write back soon, ____________________________ Lrrr & Ndnd OUR PLACE IN THE UNIVERSE? What is our Cosmic Address? Our place in the Universe? Answer Orion arm Our place in the Universe? Answer Our place in the Universe? Honolulu Hawaii 2680 Woodlawn Drive Honolulu, Hawaii, USA 96822-1839 USA Our place in the Universe? 20 miles 1 Honolulu 300 miles Hawaii 15 2680 Woodlawn Drive Honolulu, Hawaii, USA 96822-1839 2500 miles USA 125 • Describe our “cosmic address” Earth Radius = 6370 km Earth-Sun Earth - Sun average distance = 145,980,000 km = 1.4598 x 108 km = 20000 Earth radii = 1 Astronomical Unit (AU) At the scale of the Solar System distances are described in terms of the Astronomical Unit or AU. Solar System • Earth is the third planet from the sun • The solar system consists of the Sun and other astronomical objects. Light Travel Time Light travels at 3 x 105 km/sec through the vacuum of space. We can use how long does it take for light to travel from point A to B as a measure of the distance from point A to B. Milky Way Galaxy • The Milky Way is the galaxy in which the solar system is contained. Orion arm • It is a spiral galaxy • Contains 300 billion stars. Milky Way Galaxy Disk radius = 3.162 x 109 AU Orion arm = 50,000 ly Disk thickness = 1,000 ly Local Group • The Local Group is the group of galaxies that includes Milky Way. • It has ~50 galaxies • It has a binary distribution Local Group Distance to Andromeda (M31) = 2.5 x 106 ly Virgo Supercluster • The Virgo Supercluster is a irregular supercluster that includes the Local Group • It has ~100 galaxy group and clusters Virgo Supercluster Diameter = 2 x 108 ly The Universe • The Universe is commonly defined as the totality of everything that exists. The Universe 9.3 x 1010 ly across 13.3 billion years old Lecture Tutorial • Break up into groups of 2-3 –NO MORE THAN 3 • In your group, work through the following: -Looking at Distant Objects (pages 131-132): Question 1 to 8 –Discuss the answers – don’t be silent! • I will be roaming around if you need help… • If your group finishes, check your answers with another group.
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