Notes- Chapter 4, Section 4: Star Systems and Galaxies Essential QuestionHow do astronomers learn...
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![Page 1: Notes- Chapter 4, Section 4: Star Systems and Galaxies Essential QuestionHow do astronomers learn about the structure of the universe? Objectives 1. Explain.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649da75503460f94a92af5/html5/thumbnails/1.jpg)
Notes- Chapter 4, Section 4: Star Systems and Galaxies
Essential Question How do astronomers learn about the structure of the universe?
Objectives 1. Explain each type of star system.2. Describe the major types of galaxies.
![Page 2: Notes- Chapter 4, Section 4: Star Systems and Galaxies Essential QuestionHow do astronomers learn about the structure of the universe? Objectives 1. Explain.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649da75503460f94a92af5/html5/thumbnails/2.jpg)
A. Galaxies- a huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity.
What is a galaxy?
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1. Spiral galaxies- a galaxy with a bulge in the middle and arms that spiral outward in a pinwheel pattern.
a. new stars form in the arms
Explain a spiralGalaxy.
Where do new stars form?
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2. Elliptical galaxies- a galaxy shaped like a round or flattened ball.
a. contains old stars and have little gas and dust
Explain an Elliptical galaxy.
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3. Irregular galaxies- a galaxy that does not have a regular shape.
a. smaller than other types of galaxies.b. contain many bright, young stars and lots of gas and dust.
Explain an Irregular galaxy.
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4. quasars- a bright, distant galaxy with a giant black hole at its center.
a. enormous amounts of gas revolve around the black hole, the gas heats up and shines brightly.
Explain what aQuasar is.
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Summary
![Page 8: Notes- Chapter 4, Section 4: Star Systems and Galaxies Essential QuestionHow do astronomers learn about the structure of the universe? Objectives 1. Explain.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649da75503460f94a92af5/html5/thumbnails/8.jpg)
B. Star Systems and Clusters- Most stars aremembers of groups of two or more stars, called star systems.
What is a groupof two or morestars called?
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1. Multiple Star Systems a. Binary stars- star system with two stars. 1. Often one star is much brighter
and more massive than the other. 2. Dim companion star revolves
around a bright star, the dim star’s gravity causes the bright star towobble back and forth.
Explain how a binary star systemworks.
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2. Eclipsing Binaries- A system in which one starperiodically blocks the light from anotherExplain an
eclipsing binary.
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3. Star Clusters- Large groupings of stars a. Two types of star clusters
1. Open Clusters- a star cluster that has a loose, disorganized appearance and contains no more than a few thousand stars.2. Globular Clusters- a large, round,
densely-packed grouping of older stars.
Explain thetwo types ofstar clusters.
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Open Cluster named “The Pleiades” or Seven Sisters.
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Summary