- Spiral is a kind of shape
- Galaxies can be classified by shape
- So, spiral galaxy is a type of galaxy

- Spiral galaxy is a type of galaxy
- The milky way is spiral in shape
- The milky way is a kind of galaxy
- Therefore, the milky way is a kind of spiral galaxy

Therefore, the milky way is a kind of spiral galaxy
Question
What type of galaxy is the Milky Way?

Context
- Spiral is a kind of shape 
- The milky way is spiral in shape 
- Galaxies can be classified by shape 
- The milky way is a kind of galaxy