Prof. Jeff Kenney Class 1 May 28, 2018
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1 Prof. Jeff Kenney Class 1 May 28, 2018
2 Lec 1-5: Lec 6-8: Astronomy 120 intro, physics review stars Lec 9-14: galaxies, clusters & dark matter Lec 15-18: active galaxies & black holes Lec 19-24: cosmology & the universe For full syllabus see website
3 Class website main site: but most things also on canvas
4 textbook Universe (Freedman, Geller, Kaufmann) 10 th edition E-book recommended (LaunchPad) website has link hardcopies (used, looseleaf) at Yale bookstore or through Amazon (10 th or 9 th or 8 th editions are OK)
5 Remote polling & peer instruction More discussion & learning in class à Attendance important! Less material covered in class à Important to read textbook before class! à On-line Reading quizzes Must complete by 12noon the day of the class! -> Starts tomorrow Accessed from Canvas, Quizzes, RQ Lxx is the Reading Quiz for Lecture #xx
6 Computers & notetaking in class no electronic devices in class EXCEPT if you really want laptop to take notes (must first discuss with professor) no phones I will hand out paper copies of slides at start of each class for you to take notes
7 Grading 40% Weekly Homework 10% Reading quizzes 10% Attendance & Class Participation* 10% Observing & Planetarium assignment 30% Final exam *class participation lose credit if distracted during class
8 Homeworks ~2x weekly 1 st HW due this Wed May 30 2 nd HW due this Fri June 1
9 Help!? TUTORING: All hours are drop in. No appointments required QR/SC Tutoring begins Tuesday 5/29 Tuesdays, Wednesdays, Thursdays: 4:30pm-6pm (Astr, Eng, Math, Phys, Stat) Location: SML 116C in the Center for Teaching and Learning (301 York Street) Professor: Office Hours: by appt
10 SIZES & DISTANCES Electron or quark m smallest things we have measured or inferred based on physical principles quarks inside proton
11 SIZES & DISTANCES Electron or quark Proton = nucleus of H atom m m
12 SIZES & DISTANCES Electron or quark Proton = nucleus of H atom Atom m m m
13 SIZES & DISTANCES Electron or quark m Proton = nucleus of H atom m Atom m Wavelength of blue light 0.5 microns 5x10-7 m
14 SIZES & DISTANCES Electron or quark m Proton = nucleus of H atom m Atom m Wavelength of blue light 0.5 microns 5x10-7 m what is smallest thing visible to naked eye?
15 SIZES & DISTANCES Electron or quark m Proton = nucleus of H atom m Atom m Wavelength of blue light 0.5 microns 5x10-7 m Human eggcell 10 microns 10-5 m smallest thing visible to naked eye
16 SIZES & DISTANCES Electron or quark m Proton = nucleus of H atom m Atom m Wavelength of blue light 0.5 microns 5x10-7 m Human eggcell 10 microns 10-5 m Human adult 1.5m 1.5x10 0 m
17 SIZES & DISTANCES Electron or quark m Proton = nucleus of H atom m Atom m Wavelength of blue light 0.5 microns 5x10-7 m Human eggcell 10 microns 10-5 m Human adult 1.5m 1.5x10 0 m LC m 10 1 m
18 SIZES & DISTANCES Electron or quark m Proton = nucleus of H atom m Atom m Wavelength of blue light 0.5 microns 5x10-7 m Human eggcell 10 microns 10-5 m Human adult 1.5m 1.5x10 0 m LC m 10 1 m New Haven 10 km 10 4 m
19 SIZES & DISTANCES Electron or quark m Proton = nucleus of H atom m Atom m Wavelength of blue light 0.5 microns 5x10-7 m Human eggcell 10 microns 10-5 m Human adult 1.5m 1.5x10 0 m LC m 10 1 m New Haven 10 km 10 4 m Earth s diameter 12,756 km 1.3x10 7 m
20 SIZES & DISTANCES Electron or quark m Proton = nucleus of H atom m Atom m Wavelength of blue light 0.5 microns 5x10-7 m Human eggcell 10 microns 10-5 m Human adult 1.5m 1.5x10 0 m LC m 10 1 m New Haven 10 km 10 4 m Earth s diameter 12,756 km 1.3x10 7 m Earth-moon distance 384,000 km 3.8x10 8 m to scale!
21 SIZES & DISTANCES Earth s diameter 12,756 km 1.3x10 7 m Earth-moon distance 384,000 km 3.8x10 8 m Earth-sun distance 150,000,000 km 1.5x10 11 m = 93,000,000 miles = 8.3 light-minutes = 1 Astronomical Unit = 1 AU not to scale!
22 SIZES & DISTANCES Earth s diameter 12,756 km 1.3x10 7 m Earth-moon distance 384,000 km 3.8x10 8 m Earth-sun distance 150,000,000 km 1.5x10 11 m nearest star what is nearest star?
23 SIZES & DISTANCES Earth s diameter 12,756 km 1.3x10 7 m Earth-moon distance 384,000 km 3.8x10 8 m Earth-sun distance 150,000,000 km 1.5x10 11 m nearest star 4 light years (LY) 3.8x10 16 m what is nearest star? Proxima Centauri, a companion to Alpha & Beta Centauri
24 SIZES & DISTANCES Earth s diameter 12,756 km 1.3x10 7 m Earth-moon distance 384,000 km 3.8x10 8 m Earth-sun distance 150,000,000 km 1.5x10 11 m nearest star 4 light years (LY) 3.8x10 16 m most distant star seen with naked eye
25 SIZES & DISTANCES Earth s diameter 12,756 km 1.3x10 7 m Earth-moon distance 384,000 km 3.8x10 8 m Earth-sun distance 150,000,000 km 1.5x10 11 m nearest star 4 light years (LY) 3.8x10 16 m most distant star seen with naked eye 5,000 LY 4.7x10 19 m
26 SIZES & DISTANCES Earth s diameter 12,756 km 1.3x10 7 m Earth-moon distance 384,000 km 3.8x10 8 m Earth-sun distance 150,000,000 km 1.5x10 11 m nearest star 4 light years (LY) 3.8x10 16 m most distant star seen with naked eye 5,000 LY 4.7x10 19 m center of galaxy 30,000 LY 2.8x10 20 m in Sagittarius ; obscured by dust
27 SIZES & DISTANCES Earth s diameter 12,756 km 1.3x10 7 m Earth-moon distance 384,000 km 3.8x10 8 m Earth-sun distance 150,000,000 km 1.5x10 11 m nearest star 4 light years (LY) 3.8x10 16 m most distant star seen with naked eye 5,000 LY 4.7x10 19 m center of galaxy 30,000 LY 2.8x10 20 m nearest spiral galaxy 2,000,000 LY 1.9x10 22 m Andromeda galaxy = M31
28 SIZES & DISTANCES Earth s diameter 12,756 km 1.3x10 7 m Earth-moon distance 384,000 km 3.8x10 8 m Earth-sun distance 150,000,000 km 1.5x10 11 m nearest star 4 light years (LY) 3.8x10 16 m most distant star seen with naked eye 5,000 LY 4.7x10 19 m center of galaxy 30,000 LY 2.8x10 20 m nearest spiral galaxy 2,000,000 LY 1.9x10 22 m nearest galaxy cluster 50,000,000 LY 4.7x10 23 m Virgo Cluster
29 SIZES & DISTANCES Earth s diameter 12,756 km 1.3x10 7 m Earth-moon distance 384,000 km 3.8x10 8 m Earth-sun distance 150,000,000 km 1.5x10 11 m nearest star 4 light years (LY) 3.8x10 16 m most distant star seen with naked eye 5,000 LY 4.7x10 19 m center of galaxy 30,000 LY 2.8x10 20 m nearest spiral galaxy 2,000,000 LY 1.9x10 22 m nearest galaxy cluster 50,000,000 LY 4.7x10 23 m most distant galaxies known 13,000,000,000 LY 1.23x10 26 m redshift z~11, young galaxies
30 SIZES & DISTANCES Earth s diameter 12,756 km Earth-moon distance 384,000 km Earth-sun distance 150,000,000 km nearest star 4 light years (LY) most distant star seen with naked eye 5,000 LY center of galaxy 30,000 LY nearest spiral galaxy 2,000,000 LY nearest galaxy cluster 50,000,000 LY most distant galaxies known 13,000,000,000 LY edge of observable universe 13,700,000,000 LY 1.3x107 m 3.8x108 m 1.5x1011 m 3.8x1016 m 4.7x1019 m 2.8x1020 m 1.9x1022 m 4.7x1023 m 1.23x1026 m 1.30x1026 m map of cosmic microwave background radiation, almost to edge of observable universe
31 SIZES & DISTANCES Earth s diameter 12,756 km 1.3x10 7 m Earth-moon distance 384,000 km 3.8x10 8 m Earth-sun distance 150,000,000 km 1.5x10 11 m nearest star 4 light years (LY) 3.8x10 16 m most distant star seen with naked eye 5,000 LY 4.7x10 19 m center of galaxy 30,000 LY 2.8x10 20 m nearest spiral galaxy 2,000,000 LY 1.9x10 22 m nearest galaxy cluster 50,000,000 LY 4.7x10 23 m most distant galaxies known 13,000,000,000 LY 1.23x10 26 m edge of observable universe 13,700,000,000 LY 1.30x10 26 m whole universe is probably much bigger than this but we can t observe it!
32 Electron or quark Proton = nucleus of H atom Atom SIZES & DISTANCES m m m Wavelength of blue light 0.5 microns 5x10-7 m Human eggcell 10 microns 10-5 m Human adult 1.5m 1.5x10 0 m LC m 10 1 m New Haven 10 km 10 4 m Earth s diameter 12,756 km 1.3x10 7 m Earth-moon distance 384,000 km 3.8x10 8 m Earth-sun distance 150,000,000 km 1.5x10 11 m to nearest star (Proxima Centauri) 4 light years (LY) 3.8x10 16 m to most distant star you can see with naked eye 5,000 LY 4.7x10 19 m to center of galaxy 30,000 LY 2.8x10 20 m to nearest spiral galaxy (M31) 2,000,000 LY 1.9x10 22 m to nearest galaxy cluster (Virgo cluster) 50,000,000 LY 4.7x10 23 m to most distant galaxies known (z=10) 13,000,000,000 LY 1.23x10 26 m to edge of observable universe 13,700,000,000 LY 1.30x10 26 m
33 Electron or quark Proton = nucleus of H atom Atom SIZES & DISTANCES m m m Wavelength of blue light 0.5 microns 5x10-7 m Human eggcell 10 microns 10-5 m Human adult 1.5m 1.5x10 0 m range of human perception factor of in size LC m 10 1 m New Haven 10 km 10 4 m Earth s diameter 12,756 km 1.3x10 7 m Earth-moon distance 384,000 km 3.8x10 8 m Earth-sun distance 150,000,000 km 1.5x10 11 m to nearest star (Proxima Centauri) 4 light years (LY) 3.8x10 16 m to most distant star you can see with naked eye 5,000 LY 4.7x10 19 m to center of galaxy 30,000 LY 2.8x10 20 m to nearest spiral galaxy (M31) 2,000,000 LY 1.9x10 22 m to nearest galaxy cluster (Virgo cluster) 50,000,000 LY 4.7x10 23 m to most distant galaxies known (z=10) 13,000,000,000 LY 1.23x10 26 m to edge of observable universe 13,700,000,000 LY 1.30x10 26 m
34 Humans can directly perceive ~12 orders of magnitude in size Human perception ~10 12 But we have so far explored ~44 orders of magnitude in size, by using technology and our intelligence Human discovery ~10 44 Much of existence is beyond our direct experience!
35 big numbers number of atoms in universe ~ 10 80
36 big numbers number of atoms in universe ~ googol = spelled differently than the internet company due to Edward Kasner, American mathematician
37 =
38
39 big numbers 10 googol = = googolplex
40
41
42 LIGHT YEAR IS A DISTANCE!! Despite the confusing fact that a unit of time is part of the name light year = how far light travels in 1 year Light goes far in a year since light is fast! Speed of light = 3 x 10 5 km/s 1 light-year = 1 LY = 9.5x10 12 km
43 light year (still a distance ) distance = speed x time 1 light-year = 1 LY = 9.5x10 12 km = 5.7x10 12 miles (trillion) = 6x10 4 AU
44 light year is bad name light-year-distance-unit is better name
45 timescales Nuclear events (fusion, fission) sec
46 timescales Nuclear events (fusion, fission) Atomic events (e.g. light absorption) sec sec
47 timescales Nuclear events (fusion, fission) Atomic events (e.g. light absorption) Chemical events sec sec sec
48 timescales Nuclear events (fusion, fission) sec Atomic events (e.g. light absorption) sec Chemical events sec Shortest interval perceptible to humans????
49 timescales Nuclear events (fusion, fission) Atomic events (e.g. light absorption) Chemical events Shortest interval perceptible to humans sec sec sec 0.01 sec = 10-2 sec
50 timescales Nuclear events (fusion, fission) Atomic events (e.g. light absorption) Chemical events Shortest interval perceptible to humans Light travel time around earth sec sec sec 0.01 sec = 10-2 sec 1/7 sec = 0.14 sec
51 timescales Nuclear events (fusion, fission) sec Atomic events (e.g. light absorption) sec Chemical events sec Shortest interval perceptible to humans 0.01 sec = 10-2 sec Light travel time around earth 1/7 sec = 0.14 sec Rotation of earth 1 day 8.6x10 4 sec
52 timescales Nuclear events (fusion, fission) sec Atomic events (e.g. light absorption) sec Chemical events sec Shortest interval perceptible to humans 0.01 sec = 10-2 sec Light travel time around earth 1/7 sec = 0.14 sec Rotation of earth 1 day 8.6x10 4 sec Revolution of moon around earth 29.5 days ~1 month
53 timescales Nuclear events (fusion, fission) sec Atomic events (e.g. light absorption) sec Chemical events sec Shortest interval perceptible to humans 0.01 sec = 10-2 sec Light travel time around earth 1/7 sec = 0.14 sec Rotation of earth 1 day 8.6x10 4 sec Revolution of moon around earth 29.5 days ~1 month Revolution of earth around sun days = 1 year 3.1x10 7 sec
54 timescales Nuclear events (fusion, fission) sec Atomic events (e.g. light absorption) sec Chemical events sec Shortest interval perceptible to humans 0.01 sec = 10-2 sec Light travel time around earth 1/7 sec = 0.14 sec Rotation of earth 1 day 8.6x10 4 sec Revolution of moon around earth 29.5 days ~1 month Revolution of earth around sun days = 1 year 3.1x10 7 sec Human lifetime 70 yrs
55 timescales Nuclear events (fusion, fission) sec Atomic events (e.g. light absorption) sec Chemical events sec Shortest interval perceptible to humans 0.01 sec = 10-2 sec Light travel time around earth 1/7 sec = 0.14 sec Rotation of earth 1 day 8.6x10 4 sec Revolution of moon around earth 29.5 days ~1 month Revolution of earth around sun days = 1 year 3.1x10 7 sec Human lifetime 70 yrs Rev. of solar system around galactic center 2x10 8 yr = galactic year
56 timescales Nuclear events (fusion, fission) sec Atomic events (e.g. light absorption) sec Chemical events sec Shortest interval perceptible to humans 0.01 sec = 10-2 sec Light travel time around earth 1/7 sec = 0.14 sec Rotation of earth 1 day 8.6x10 4 sec Revolution of moon around earth 29.5 days ~1 month Revolution of earth around sun days = 1 year 3.1x10 7 sec Human lifetime 70 yrs Rev. of solar system around galactic center 2x10 8 yr Age of sun and earth 4.5x10 9 yr
57 timescales Nuclear events (fusion, fission) sec Atomic events (e.g. light absorption) sec Chemical events sec Shortest interval perceptible to humans 0.01 sec = 10-2 sec Light travel time around earth 1/7 sec = 0.14 sec Rotation of earth 1 day 8.6x10 4 sec Revolution of moon around earth 29.5 days ~1 month Revolution of earth around sun days = 1 year 3.1x10 7 sec Human lifetime 70 yrs Rev. of solar system around galactic center 2x10 8 yr Age of sun and earth 4.5x10 9 yr Age of universe (time since Big Bang) 13.7x10 9 yr 4.2x10 17 sec
58 timescales Nuclear events (fusion, fission) sec Atomic events (e.g. light absorption) sec Chemical events sec Shortest interval perceptible to humans 0.01 sec = 10-2 sec Light travel time around earth 1/7 sec = 0.14 sec Rotation of earth 1 day 8.6x10 4 sec Revolution of moon around earth 29.5 days ~1 month Revolution of earth around sun days = 1 year 3.1x10 7 sec Human lifetime 70 yrs Rev. of solar system around galactic center 2x10 8 yr Age of sun and earth 4.5x10 9 yr Age of universe (time since Big Bang) 13.7x10 9 yr 4.2x10 17 sec astronomical cycles give us our most important units of time
59 timescales Nuclear events (fusion, fission) sec Atomic events (e.g. light absorption) sec Chemical events sec Shortest interval perceptible to humans 0.01 sec = 10-2 sec Light travel time around earth 1/7 sec = 0.14 sec Rotation of earth 1 day 8.6x10 4 sec Revolution of moon around earth 29.5 days ~1 month Revolution of earth around sun days = 1 year 3.1x10 7 sec Human lifetime 70 yrs 10 9 sec Rev. of solar system around galactic center 2x10 8 yr Age of sun and earth 4.5x10 9 yr Age of universe (time since Big Bang) 13.7x10 9 yr 4.2x10 17 sec range of human perception in time ~10 11
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