The main component of the atmosphere on Mars is carbon dioxide.
- Earth’s atmosphere is a mixture of nitrogen (79%), oxygen (20%), and a small fraction of carbon dioxide, water vapours and other gases. This makes the existence of life possible on Earth.
- However, the atmospheres on Mars mainly consist of carbon dioxide.
- The amount of carbon dioxide on Mars planets can range from 95% to 97%.
- This may be the reason no life exists on these planets.