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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),
Galaxies The Universe is filled with these star systems which themselves cluster together into larger systems.
16 Galaxies Island Universes. 16 Copyright – FORS1 VLTI, European Southern Observatory.
Expanding Space. In an infinite Universe… Size Age Every line of sight would end on a star. Every star would be observable. The night sky would be very.
What are Other Galaxies Like? Chapter Remember that galaxies are groups of stars held together by gravity Remember that galaxies are groups of stars.
March 4, 2003Lynn Cominsky - Cosmology A3501 Professor Lynn Cominsky Department of Physics and Astronomy Offices: Darwin 329A and NASA EPO (707)
Galaxies Read Your Textbook: Foundations of Astronomy –Chapter 16, 17 Homework Problems Chapter 16 –Review Questions: 1, 2, 5-7, 10 –Review Problems: 1,
The Big Bang. Cosmology – The study of the structure and evolution of the universe. Big Bang Theory – The universe was very hot and small. Billions.
H205 Cosmic Origins Today: Galaxies (Ch. 20) Wednesday: Galaxy Evolution (Ch. 21) EP 4 & Reflection 1 on Wednesday APOD.
Galaxies and The Big Bang. What are galaxies? How do they relate to the Big Bang Theory? Galaxies formed from the gas, dust, and matter propelled into.
Ohio University - Lancaster Campus slide 1 of 17 Spring 2009 PSC 100 Hubble’s Law: The Age, Size, and Expansion of Our Universe.
Hubble’s Law. Edwin Hubble ( ) Measured distances to nearby galaxies using Cepheid variables Galaxies are islands of stars Developed a classification.
GALAXIES? So you want to know more about. Types of Galaxies.
Deep Extragalactic Space The basic “yardstick” of distance is now the Megaparsec = 3.3 million light years Question: how do we determine the distances.
© 2004 Pearson Education Inc., publishing as Addison-Wesley A Universe of Galaxies.
Ch1 0 The Big Bang Where do we come from, where are we going?
Section #3: The Universe. Galaxies are large groups of stars dusts and gases held together by gravity. Our galaxy is the Milky Way galaxy, and it.
Edwin Hubble An Astronomer at the Mount Wilson Observatory in California. An Astronomer at the Mount Wilson Observatory in California.
Galaxies Chapter 16. Topics Types of galaxies Dark Matter Distances to galaxies Speed of galaxies Expansion of the universe and Hubble’s law.
Agenda: galaxies The Milky Way Types of galaxies Finding distances to galaxies.
1 Cosmology HNRT 227 Chapter October 2015 Great Idea: The universe began billions of years ago in the big bang and it has been expanding ever since.
Expanding Space. In an infinite Newtonian Universe… Size Age Successive shells of stars – # of stars increases R 2 Intensity decreases 1/R 2 Shells are.
Most evidence today indicates that the age of the Universe is billion years million years billion years million years.
Astronomy Topic 4 Revision Booster. Milky way facts 200 billion stars 250 million years to orbit One of a group of about 30 galaxies (The local group)
GALAXY FORMATION AND EVOLUTION - 1. The Expansion of Galaxies In the 1920’s, Edwin Hubble demonstrated that all the `nebulae’ observed in the sky, which.
Announcements. Lab 15: Hubble’s Law Tiffany Pewett
Hubble’s Law: Measuring the Age of the Universe Dr Lisa Jardine-Wright Cavendish Laboratory, University of Cambridge.
15 The Big Bang Where do we come from, where are we going?
GALAXIES Pages Galaxies Def: large scale groups of stars (approx. 100 billion) bound by gravitational attraction- rotates around a center Def:
The Solar System. Our Solar System The Sun Mercury 0 moons Venus 0 moons Earth 1 moon Mars 2 moons Jupiter 67 moons Saturn 62 moons Uranus 27 moons Neptune.
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