Question

1. what is the correct hierarchy of structures within the universe starting with the smallest in size?

• galaxy cluster, galaxy, solar system, planet
• solar system, galaxy, planet, galaxy cluster
• galaxy, planet, galaxy cluster, solar system
• planet, solar system, galaxy, galaxy cluster

Explanation:

To determine the correct hierarchy, we analyze the size of each structure: A planet is a celestial body (smallest). A solar system consists of a star and its orbiting planets (larger than a planet). A galaxy is a collection of billions of stars and solar systems (larger than a solar system). A galaxy cluster is a group of multiple galaxies (largest among these). So the order from smallest to largest is planet, solar system, galaxy, galaxy cluster.

Answer:

D. planet, solar system, galaxy, galaxy cluster