star, galaxy, solar system, universe star, solar system, galaxy, universe star, solar system, universe, galaxy star, universe, solar system, galaxy
I gave my students this multiple choice question: Which of the following correctly lists the structures in space from smallest to largest?

Only one answer is correct among these 4 choices:
- star, galaxy, solar system, universe
- star, solar system, galaxy, universe
- star, solar system, universe, galaxy
- star, universe, solar system, galaxy

Could you tell me which one is correct?

star, solar system, galaxy, universe