Question

1. what is the correct hierarchy of structures within the universe starting with the smallest in size? planet, solar system, galaxy, galaxy cluster solar system, galaxy, planet, galaxy cluster galaxy, planet, galaxy cluster, solar system galaxy cluster, galaxy, solar system, planet

Explanation:

A planet is a celestial body that orbits a star. A solar system consists of a star and all the objects that orbit it, including planets. A galaxy is a massive system of stars, gas, and dust. A galaxy cluster is a group of galaxies bound together by gravity. So, starting from the smallest in size, the correct hierarchy is planet, solar system, galaxy, galaxy cluster.

Answer:

planet, solar system, galaxy, galaxy cluster