the color of the galaxy the shape of the galaxy how many stars make up the galaxy how many planets make up the galaxy
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Classification of galaxies is based on which characteristic?
Possibilities:
- the color of the galaxy
- the shape of the galaxy
- how many stars make up the galaxy
- how many planets make up the galaxy

the shape of the galaxy