JK2006 wrote:
There never was any; too cold.
But as global warming continues, the Earth will burn out (as happened to Venus) and become too hot for life which will develop on Mars, as it warms...
The frozen ice below the surface will melt and turn to water.
Life will then emerge for a few million centuries - then, in due course, as the Sun gets hotter, it too will burn out and the next in line (Jupiter? Saturn?) will warm up... and so on.
I think the Sun is getting hotter and hotter until it will eventually burn out.
Am I mad?
I never eliminate insanity as a root cause for my ideas...
Potentially, Jupiter could get enough mass to ignite during the death throes of the Sun, but it's unlikely.
As to life... looking at the profligate way the rocky planets swap bits of themselves, life had had every chance of going to, or coming from(!), Mars
Having dabbled in Astronomy, I keep a weather eye on developments, and currently it looks (to me) like it's been possible for primitive life to have existed in the universe for around 12 billion (US billion) years, give or take...
My reasoning is linked
here(The reasoning, calculation et all are all mine... so if it's wrong then it's mea culpa, mea maxima culpa)
As to Mars being too cold. If there was running water, then it was warm enough. Life is a tough thing... it can survive in the unlikeliest places...