Galaxies.

Slides:

Advertisements

Similar presentations

Week 8 Galaxies Reading: Chapter 15, Sections 1, 3 (9 pages)

Advertisements

The Universe of Galaxies. A Brief History Galileo.

The Milky Way Galaxy part 2

AST 101 The Realm of the Nebulae. Meet the Neighbors.

Galaxies Astronomy 315 Professor Lee Carkner Lecture 20.

TYPES OF GALAXIES. Edwin Hubble Early 1900’s: astronomers determined that galaxies appear in a low number of shapes Hubble (1920s): developed a classification.

Formation of Galaxies Types of Galaxies

Galaxies Chapter 16. Galaxies Star systems like our Milky Way Contain a few thousand to tens of billions of stars. Large variety of shapes and sizes.

Galaxies Chapter 13:. Galaxies Contain a few thousand to tens of billions of stars, Large variety of shapes and sizes Star systems like our Milky Way.

Galaxies Your complete address is part of a much larger system than your street, city, state, country, and even the planet Earth.

Another galaxy: NGC The Milky Way roughly resembles it.

The Universe Looking at Galaxies. The Universe Early in the history of the universe, hydrogen and helium (and other forms of matter) clumped together.

Galaxies. Galaxies A galaxy is a huge region of space that contains hundreds of billions of stars, planets, glowing nebulae, dust, empty space, and possibly.

The Milky Way Appears as a band of light stretching across the sky There are dark regions along the band, giving the appearance of a lack of stars This.

Historical background Until the 1920's it was believed that our Milky Way was all there was to the universe. As early as the 18th century, the philosopher.

STARS & GALAXIES Our Local System. A STAR PARTY!!! The largest gatherings in the universe! Galaxies-Are large scale groups of stars that are bounded together.

Cosmology and extragalactic astronomy Mat Page Mullard Space Science Lab, UCL 2. Galaxies.

GALAXIES, GALAXIES, GALAXIES! A dime a dozen… just one of a 100,000,000,000! 1.Galaxy Classification Ellipticals Dwarf Ellipticals Spirals Barred Spirals.

Galaxies. A galaxy is a large group of stars, dust, and gases. They come in variable sizes and shapes. The largest have over a trillion stars.

GALAXIES. There are Three main classes (as classified by Hubble). A. Spiral B. Elliptical C. Irregular 1. Spiral galaxies. Disk + central bulge. M51 M51.

Galaxy Classification Image Credit: NASA. Theory Presentation The aim of this project will be to introduce students to the concept of varying galactic.

10.2 Galaxies Galaxies are a collection of stars, gas and dust held together by gravity Our star, the sun, is one of 100 million stars in the Milky Way.

The Hubble Ultra Deep Field, or HUDF, catalogs thousands of galaxies in a small section of space in the southern constellation Fornax. Previous versions.

Galaxies Star systems like our Milky Way

Galaxies and Stars.

Light Years, Important People, Galaxies

Galaxies Galaxies are huge gravitationally bound collections of gas, stars, planets, ice and dust. They come in a large variety of different shapes and.

Types & Hubble’s Classification Scheme

Notes-Galaxies The Universe includes everything that we know exists, everything we can see or know about in space is included.

Bell Ringer If the sun were about the size of a golf ball, and it were placed on the goal line of a football field, where would the Earth be? Neptune?

Astronomy-Part 1 Notes The Structure of the Universe

Notes: Galaxies.

Galaxies Chapter 30 Section 3.

The Universe… …is space and everything in it.

Organization of the universe

Earth’s Galactic Address

Galaxy Classification

Chapter 24 Galaxies Chapter 24 opener. Active galaxies are much more energetic than the normal galaxy—the Milky Way—in which we live. The “central engines”

Galaxies And the Foundation of Modern Cosmology

When Giovanni Riccioli used a telescope like this one to observe a star in the handle of the Big Dipper, he discovered two stars that orbit each other.

Galaxies Types How would you classify by name these three different types of galaxies in one word?

Galaxies Galaxies Chapter 15-3 Pg pp

When Giovanni Riccioli used a telescope like this one to observe a star in the Big Dipper, he discovered two stars that orbit each other. A group of stars.

Galaxies Galaxies Chapter 15-3 Pg pp

Chapter 19 Section 3 Galaxies Bellringer

ALL space and everything that is in it.

Objective 04/12/2013 Identify three types of galaxies. Intro

Announcements Observing for third exam starts today.

Galaxies Galaxies Chapter 15-3 Pg pp

Organization of the universe

The Big Bang Timeline Rapid Expansion of the Universe

21.4 Star systems and galaxies

Presentation transcript:

Galaxies

Galaxies Huge (>1000’s ly across) Gravitationally bound Collections of gas, stars, planets, ice & dust.

Galaxies Different shapes & sizes. Dwarf containing tens of millions (107) of stars, Supergiants containing up to a trillion stars (1012). > 100 billion (1011 ) galaxies in the observable universe.

Galaxies Ecosystems of the Universe Gas Stars (& vice versa) No star formation between galaxies (intergalactic space)

Edwin Hubble In 1924, he divided galaxies into different “classes” based on their appearance.

Galaxy Types

Hubble’s Classification Scheme

Elliptical Galaxies ~ 50% of all galaxies They are gas poor little star formation smooth featureless light distribution & appear elliptically shaped in found near the center of rich galaxy clusters.

Elliptical Classification Scheme Identified by the letter E 0 -7 O is the most spherical, 7 is the most elliptical

by amount of flattening Elliptical Examples 0-7 determined by amount of flattening

Lenticular Galaxies* About 20% of all galaxies Between elliptical & spiral Have central bulge but no arms Aging, little star formation * Hubble added later

Spiral Galaxies ~ 20% of all galaxies* They are gas rich But 70% of visible galaxies due to their brightness. They are gas rich Lots of star formation More isolated

Spiral Classification Scheme Identified by the letter S B is added if barred spiral

Spiral Examples: Sa very tightly wound spiral arms bright central bulge Ex: Messier 81 “Bode’s Galaxy”

Spiral Examples: Sb Ex: M51 “Whirpool Galaxy” less tightly wound spiral arms fainter central bulge.

Spiral Examples: Sc loosely wound spiral arms smaller, fainter central bulge. Ex: NGC 6946 New general catalogue of galaxies and nebulae 1886 originally but updated since, most recent 2009

Barred Spiral Examples classified in the same way as non-barred spiral galaxies.

Irregular Galaxies about 5% No symmetry Lots of young, blue stars and interstellar material Smaller than most spirals and elliptical galaxies

Irregular Galaxies Large & Small Magellenic “Clouds” LMC, SMC