Galaxies Chapter 30 Section 3.

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Presentation transcript:

Galaxies Chapter 30 Section 3

What is a Galaxy? A collection of stars, gas and dust held together by gravity. Major building block of the universe. Estimated that there are hundreds of billions of galaxies in our universe.

Size/Distances to Galaxies Astronomers use stars detected within galaxies to estimate the distance. Size ranges from a few thousand light years across to several hundred thousand light years across. Example the Milky way is about 100,000 light years across. Equal to 20 million solar systems.

Types of Galaxies Classified by Shape Spiral The Milky Way is a large spiral galaxy. Composed of a nucleus of bright stars Arms spin around the nucleus Contain young stars, gas, and dust

Types Continued Elliptical Galaxies Vary in shape from nearly spherical to very elongated Very Very Bright center Do not have spiral arms Contain little dust and gas Few young stars

Irregular Galaxy Has no particular shape Total mass is small Contain a large amount of gas and dust Very few are observed