Why did the terrestrial planets lose their primary atmospheres?
A) Their low gravities couldn't hold them.
B) The solar wind blew them away.
C) Their high surface temperatures made them chemically react with rock.
D) The centrifugal force from their fast rotation rates made them fly off.

Question

Quizplus · Accepted Answer

Terrestrial planets have relatively low gravity compared to gas giants, which made it difficult for them to retain their primary atmospheres composed of light gases like hydrogen and helium.

Why Did the Terrestrial Planets Lose Their Primary Atmospheres