Kentucky Association for Academic Competition (KAAC) Practice Test 2026 - Free KAAC Practice Questions and Study Guide

Jupiter is the largest planet in the solar system and is often compared to the sun in terms of composition. Both Jupiter and the sun are predominantly made up of hydrogen and helium, which are the primary elements that make up most of the universe. Jupiter's mass is more than 300 times that of Earth and it has a diameter that is about 11 times wider than our planet. This immense size and similar composition to the sun position Jupiter distinctly within our solar system.

Earth, Saturn, and Neptune, while they have their unique qualities, do not share the same magnitude or compositional similarity to the sun as Jupiter does. Earth is a terrestrial planet with a solid surface and a disproportionately small amount of hydrogen and helium. Saturn, although a gas giant like Jupiter, is smaller and has a different ratio of gases. Neptune is an ice giant, which makes its composition significantly different from that of both Jupiter and the sun. Therefore, Jupiter stands as the most fitting choice when considering the largest planet that shares a solar-like composition.