The inner and outer planets have similar atmospheres.

Question

Quizplus · Accepted Answer

The inner planets (Mercury, Venus, Earth, and Mars) have very different atmospheres from the outer planets (Jupiter, Saturn, Uranus, and Neptune). The inner planets have relatively thin atmospheres composed mainly of nitrogen and oxygen (Earth's atmosphere also contains carbon dioxide), while the outer planets have much thicker atmospheres composed mainly of hydrogen and helium with some other gases like methane and ammonia.

The Inner and Outer Planets Have Similar Atmospheres