Question

Which of the following characterizes do all of the outer planets have in common

Answer 1

They are all gas planets. They are also larger than the inner planets.

Answer 2

The correct answer is option D. They are mostly made up of hydrogen and helium.

Outer planets are mostly made up of gases and are huge in size. These gases are hydrogen and helium. These outer planets are Saturn, Jupiter, Uranus, and Neptune

(credit to task maskers.)