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RE: THE BIOGRAPHY OF THE UNIVERSE - Earth's Evolution (Part 3)
Mars, had an abundance of water during the early stages of its life. This increases the chances of life having existed on the planet in times past. NASA has also observed that one of the moons of Jupiter has an abundance of water covered with an icy layer.
So that's why it is usually portrayed in movies how it is possible to live in Mars and Jupiter because of the presence of water. But how about the air?
The atmospheric makeup of both Mars and Jupiter cannot support live right now, due to their atmospheric makeup. Jupiter's atmosphere is mainly made up of Hydrogen, while that of Mars is mainly carbon dioxide.
Some 4.5 billion years ago, Earth's atmosphere was mainly carbon dioxide, and there was little or no oxygen. But due to environmental changes, today, Earth has become habitable.
I believe in the distant future, the same can happen for Mars and Venus, who both share similar atmospheric conditions, that Earth once had.