Download - 4.3 Galaxies are Different Shapes and Sizes
![Page 1: 4.3 Galaxies are Different Shapes and Sizes](https://reader033.vdocuments.us/reader033/viewer/2022052913/55d4af4ebb61eb7a428b474f/html5/thumbnails/1.jpg)
Low- Mass Stars Both High-Mass Stars
Form inside a nebula
Produce energy by fusion
Go through Main Sequence stage
Less time in Main Sequence- use fuel quickly
Main sequence into Super Giant
No more fuel- super giant explode
Supernova
Become either:
Neutron Star
Black Hole
More time spent in Main Sequence- use fuel more slowly
Star expands into a giant star
Giant star sheds outer layers become a white dwarf
![Page 2: 4.3 Galaxies are Different Shapes and Sizes](https://reader033.vdocuments.us/reader033/viewer/2022052913/55d4af4ebb61eb7a428b474f/html5/thumbnails/2.jpg)
GALAXIES HAVE DIFFERENT
SIZES & SHAPES
Space ScienceChapter 4: Section 4.3
![Page 3: 4.3 Galaxies are Different Shapes and Sizes](https://reader033.vdocuments.us/reader033/viewer/2022052913/55d4af4ebb61eb7a428b474f/html5/thumbnails/3.jpg)
What is a Galaxy?huge grouping of stars, gas, and dust held together by gravity
![Page 4: 4.3 Galaxies are Different Shapes and Sizes](https://reader033.vdocuments.us/reader033/viewer/2022052913/55d4af4ebb61eb7a428b474f/html5/thumbnails/4.jpg)
How did the Milky Way get it’s name?because of its milky and hazy appearance
![Page 5: 4.3 Galaxies are Different Shapes and Sizes](https://reader033.vdocuments.us/reader033/viewer/2022052913/55d4af4ebb61eb7a428b474f/html5/thumbnails/5.jpg)
The Milky Way Galaxy is shaped like a disc with a huge bulge in the middle.
Why do we not see the center of the galaxy from Earth?
The center of the galaxy is hidden by all of the surrounding dust.
![Page 6: 4.3 Galaxies are Different Shapes and Sizes](https://reader033.vdocuments.us/reader033/viewer/2022052913/55d4af4ebb61eb7a428b474f/html5/thumbnails/6.jpg)
Review: What is a light-year?The distance it takes for light to travel in one year
Which is?6 trillion miles
![Page 7: 4.3 Galaxies are Different Shapes and Sizes](https://reader033.vdocuments.us/reader033/viewer/2022052913/55d4af4ebb61eb7a428b474f/html5/thumbnails/7.jpg)
The main bulge of
the galaxy is 26,000
light years from the
sun.
![Page 8: 4.3 Galaxies are Different Shapes and Sizes](https://reader033.vdocuments.us/reader033/viewer/2022052913/55d4af4ebb61eb7a428b474f/html5/thumbnails/8.jpg)
The Milky Way contains clouds of dust and gas called nebula.
Review: Why are nebula important?
Nebula are the birth place of stars
![Page 9: 4.3 Galaxies are Different Shapes and Sizes](https://reader033.vdocuments.us/reader033/viewer/2022052913/55d4af4ebb61eb7a428b474f/html5/thumbnails/9.jpg)
How we Classify Galaxies:
Spiral GalaxyHave arms of stars
and dust that curve away from the center
Has a central bulge which consists mostly of old stars
Spiral arms are new stars
![Page 10: 4.3 Galaxies are Different Shapes and Sizes](https://reader033.vdocuments.us/reader033/viewer/2022052913/55d4af4ebb61eb7a428b474f/html5/thumbnails/10.jpg)
Elliptical GalaxyShaped like spheres
or eggsNo dust or gas
between starsAll stars are old
![Page 11: 4.3 Galaxies are Different Shapes and Sizes](https://reader033.vdocuments.us/reader033/viewer/2022052913/55d4af4ebb61eb7a428b474f/html5/thumbnails/11.jpg)
Irregular GalaxyFaint galaxiesNo definite shapeSmaller than other
galaxiesHave fewer starsContains mostly
young stars
![Page 12: 4.3 Galaxies are Different Shapes and Sizes](https://reader033.vdocuments.us/reader033/viewer/2022052913/55d4af4ebb61eb7a428b474f/html5/thumbnails/12.jpg)
Types of Galaxies- KIM StrategyKey Concept Information
Spiral Galaxy *Have arms of stars and dust that curve away from the center *Has a central bulge which consists mostly of old stars*Spiral arms are new stars*Example: The Milky Way
Elliptical Galaxy *Shaped like spheres or eggs*No dust or gas between stars*All stars are old
Irregular Galaxy *Faint galaxies*No definite shape*Smaller than other galaxies*Have fewer stars
![Page 13: 4.3 Galaxies are Different Shapes and Sizes](https://reader033.vdocuments.us/reader033/viewer/2022052913/55d4af4ebb61eb7a428b474f/html5/thumbnails/13.jpg)
Memory Clue In the last column draw a picture of the
type of GalaxyRefer to page 132 if you need a reference point
When finished:Get a Picture Sort Sheet from Miss. HudakCut and sort the pictures according to their
shapeStaple them to the appropriate column
![Page 14: 4.3 Galaxies are Different Shapes and Sizes](https://reader033.vdocuments.us/reader033/viewer/2022052913/55d4af4ebb61eb7a428b474f/html5/thumbnails/14.jpg)
Review
http://www.brainpop.com/science/space/galaxies/