Before we talk about life on Mars, I would like to direct a simple question at you! What is the planet shown in the image below? Is it the Earth or is it Mars? Looks a lot like the Earth to me.
The answer is No! This is not the Earth. This is how Mars looked like a billion years ago. Mars had a vast amount of water on its surface and a nice atmosphere surrounding it. Does this mean we can live there?
Unfortunately, we cannot live on Mars now. Though this planet was covered in water and an atmosphere similar to the Earth, it is not the same anymore. Over the years, Mars has turned into a dry, cold, almost brutal planet where no human could possibly live. Therefore, life on Mars holds to be a theory in books up to date.