1. Characteristics Of Stars
Galaxy: A collection of stars, gases and dust.
Universe: Contains billions of
galaxies.

2. Types of Galaxies
1. Spiral
2. Elliptical
3. Irregular

3. Spiral Galaxies: Arms spiral outward like a pinwheel
Our galaxy, The Milky Way, is a spiral galaxy
Middle aged Galaxy
Sometimes has a bar running through the middle – barred spirals
Some gas and dust

4. Elliptical Galaxies: Circle or elliptical (oval) shape
Can look like flattened balls or a football.
Have billions of stars, but little gas and dust.
The oldest galaxies

5. Irregular Galaxies No definite shape Less stars and more gas and dust
Youngest galaxy
Example: Large Magellanic Cloud

6. Types of Galaxies Elliptical Spiral Irregular
This kind of galaxy has an oval or circular shape. It is the oldest of the galaxies.
Spiral
This kind of galaxy has two or more “arms.” It is shaped like a pinwheel. This galaxy is middle aged.
Irregular
These galaxies have no particular shape. They are oddly shaped. These are young galaxies.