Jovian planets Halley's comet Milky Way galaxy Orion's belt
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Structures in the universe are grouped into large systems, each of which are made up of smaller systems. Which of the following is the largest system of which Earth is only a very small part?
Possibilities:
- Jovian planets
- Halley's comet
- Milky Way galaxy
- Orion's belt

Milky Way galaxy