1. Galaxies

2. Galaxies
What are they?
Large group of stars, gas, and dust held together by gravity
Separated by huge distances
Stars are grouped together in
galaxies; galaxies are grouped
together in clusters
Our Sun is one star among
many in a galaxy

3. Types of Galaxies Elliptical There are 3 types…
Contain little gas and dust, bright in the center
Shaped as large
3-Dimensional
ellipses

4. Types of Galaxies Spiral Has spiral arms Made of gas and dust
Most common type of galaxy

5. Types of Galaxies Irregular Includes the other galaxies that do not
fit into the other
classifications
Has many different
shapes and sizes

6. The Milky Way
Our galaxy contains about 200 billion stars, including the Sun
About 100,000 light years across
The Sun is located about 30,000 light years from the center, along the edge
100,000 light years

7. The Milky Way All stars orbit in a central region
Classified as normal spiral galaxy… might be a barred spiral… since we can’t see it from the outside, we are not sure

8. The Milky Way

9. The Milky Way