Nathalie Cabrol

So we are trying to prove the contrary, right?

So this is what we have right now.

And as far as I'm concerned, considering all the unknowns we have, I think there was as much chance that life...

originated on Mars than it did on Earth.

And if it was at the surface, then it got in trouble after 500 million years because of the disappearance of the magnetosphere, the loss of the magnetosphere and the atmosphere.

But as we know, you know, life doesn't only stay in one place.

As soon as it's out there, it's going to adapt, it's going to give itself more chance to survive.

And that to me means that if life appeared, I would say it's still there and probably on the ground where it can be in an environment that's more stable.

So I don't know how stability is good or not.

It might not be so good, but they might be in a different type of metabolism through dormancy, waiting for different climate cycles.

And there is the fact that Mars changes a lot faster

than the Earth.

And climate changes are a lot stronger in magnitude.

So there might be a place on Mars.

We know that there is a place on Mars deeper in the subsurface where temperature and pressure are good for liquid water to stay there.

So these would be good places for a stable habitat over time, no matter what happens at the surface.

But if life is also caught between that deep zone and the surface, there is an active layer.

There is a lot of ice in the subsurface of Mars.

And when the climate changes...

When the obliquity goes beyond 30 degrees, then at that point, you will have some activation of that zone.