The Planets

1. What is the primary gas in the Jovian atmospheres?
Hydrogen
2. What is the primary gas in Mars and Venus?
Carbon Dioxide
3. If you had to visit one planet, which would it be? Why?
Give me a solid paragraph. (consider many factors such as location, temperature, atmosphere composition, and anything else you you feel is important)
I Would have to say one of the most livable plantes besides Earth would be Mercury. I only say this because it actually has oxygen.