Blast into 2025: Conquer the Astronomy Challenge – Your Cosmic Adventure Awaits!

Question: 1 / 460

Which of the following describes an outer planet?

A planet closest to the Sun

A planet that is a gas giant

The description of an outer planet aligns with being a gas giant because outer planets are characterized by their large sizes, gaseous compositions, and lack of solid surfaces. The outer planets in our solar system—Jupiter, Saturn, Uranus, and Neptune—are all gas giants that primarily consist of hydrogen and helium. They also possess extensive ring systems and numerous moons.

In contrast, inner planets, or terrestrial planets, such as Earth and Mars, have solid surfaces and are smaller in size. The other choices describe features that do not apply to the outer planets; for instance, being closest to the Sun refers to Mercury, while Earth's position in the solar system does not overlap with outer planets. This distinction makes the designation of gas giants vital in categorizing and understanding the outer planets' unique characteristics.

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A terrestrial planet with a solid surface

A planet that orbits between Earth and Mars

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