Question: Could we plant plants on another planet? And would they grow? If we put them in a sort of greenhouse with carbon dioxide supply?

Catherine Rix answered on 15 Mar 2012:

Plants need water, sunlight, carbon dioxide and various other nutrients to grow. If we planted them on another planet it would have to be the right temperature for there to be liquid water and the soil would have to have the right nutrients in it. The soil on Mars would probably be ok to grow plants in, but there is no liquid water, and the atmosphere is too thin. They might grow in a heated greenhouse with pumped in carbon dioxide on Mars though :). If the gravity on the other planet was different they might grow in strange ways too.