Why does a planet's size matter when predicting if it can support life?
A) Gravity will determine if a planet can retain an atmosphere.
B) Large worlds are most likely to have life based on our own Solar System.
C) Only very large worlds have atmospheres.
D) Water only exists on very large planets.

Question

Quizplus · Accepted Answer

A planet's size affects its gravity, which in turn affects its ability to hold onto an atmosphere. A smaller planet may lose its atmosphere to space, while a larger planet may have too much atmospheric pressure for life to exist. Therefore, the size of a planet is an important factor in predicting if it can support life.

Why Does a Planet's Size Matter When Predicting If It