Astro 100 Kuhn chapter 7 suggested recall questions 3. So cool, massive planets are more likely to have atmospheres. Terrestrial planets are more rocky. All the other selections apply to Jovian planets.
Carbon dioxide is made up of one carbon and two oxygen atoms, hydrogen of two hydrogen atoms.
The carbon dioxide is 22 times more massive than the hydrogen. So the giant planets had more material to draw from, which lead to them getting quite massive, and contributes to their being able to hold onto even the lightest gases. Back to Astro 100 problem page.