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Types of Galaxies Spirals (77%) Ellipticals (20%) Irregulars (3%) National Optical Astronomy Observatory images
a: NASA/Hubble Space Institute; b: Robert Gendler; c: Anglo- Australian Observatory
(a)NASA; (b) Royal Observatory, Edinburgh
a: J. D. Wray, McDonald Observatory; b, c: 1999 Princeton University Press/Zsolt Frei and James E. Gunn
Closer Galaxies move away from us Farther Galaxies move away from us faster
Hubble’s Constant Tells Age: H 0 = Velocity/Distance = 1 / Time Hubble’s Law: Velocity = H 0 x Distance
Physics 202: Introduction to Astronomy – Lecture 21 Carsten Denker Physics Department Center for Solar–Terrestrial Research.
14 Galaxies Island Universes. 14 Copyright – FORS1 VLTI, European Southern Observatory.
GBT in the Hills National Radio Astronomy Observatory Green Bank, WV.
The Life of the Universe Geraint Lewis Sydney Institute of Astronomy The Hubble Deep Field: NASA/ESA/S. Beckwith(STScI) and The HUDF Team.
10A Galaxies Island Universes. 10A Copyright – Adam Block, KPNO.
1 Galaxies The Andromeda Galaxy - nearest galaxy similar to our own. Only 2 million light years away! Galaxies are clouds of millions to hundreds of billions.
Lecture 36: The Expanding Universe. Review the ‘zoo’ of observed galaxies and the Hubble Sequence the ‘zoo’ of observed galaxies and the Hubble Sequence.
Astronomy! Emily Cunningham Institut d’Astrophysique de Paris.
How old is the Universe? Presented by Miles Hudson All images courtesy of NASA and Hubblesite.org.
Chapter 16 The Milky Way Galaxy 16.1 Overview n How many stars are in the Milky Way? – About 200 billion n How many galaxies are there? – billions.
Why is the sky dark at night? Distant galaxies are receding from us with a speed proportional to distance.
The Island Universe Theory The Milky Way: Our Island Containing the Sun.
The Milky Way What type of galaxy is our Milky Way?? A. Spiral B. elliptical C. irregular A.
The Nature of Galaxies Chapter 17. Other Galaxies External to Milky Way –established by Edwin Hubble –used Cepheid variables to measure distance M31 (Andromeda.
[ 실습 ] Hubble’s Law Hubble’s Law Edwin Hubble (1889 ~ 1953) * Period – Luminosity Relation of Cepheid Variable (Henrietta Leavitt, 1912)
Pictures of telescopesPg. 96 TelescopesPg. 97.
A galaxy is a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space.
Classifying galaxies Big Bang Active galaxies Our Local Group Random $ 200 $ 200$200 $ 200 $400 $ 400$400 $ 400 $600 $ 600$600 $ 600 $ 600 $800 $
A105 Stars and Galaxies This week’s units: 74, 75, 76, 78, 79 News Quiz Today Galaxies homework due Thursday Projects due Nov. 30 Today’s APODAPOD.
Space The final frontier. The Universe Includes all existing matter, energy, and space Includes all planets (can’t count them), solar systems (billions),
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