My understanding is that Venus/Mars are close enough to Earth that, even without factoring human intervention, we still likely wouldnt be able to rule out cross contamination between the inner planets
Venus is close to earth in that it has a dense atmosphere and is about the same size. Somewhere in the atmosphere is probably a layer that has enough oxygen, pressure, and is shielded from enough radiation for life to survive.
Mars is very different from either of earth or Venus.
It has 1% of the atmosphere as earth, what atmosphere it does have has nearly all CO2, and it only has 1/3rd the gravity. Its surface is constantly blasted by enough solar radiation to effectively sterilize anything on the surface, and the ground is full of toxic salts. I would much rather be in a cloud on Venus than anywhere on the surface of mars.
My understanding is that Venus/Mars are close enough to Earth that, even without factoring human intervention, we still likely wouldnt be able to rule out cross contamination between the inner planets
Venus is close to earth in that it has a dense atmosphere and is about the same size. Somewhere in the atmosphere is probably a layer that has enough oxygen, pressure, and is shielded from enough radiation for life to survive.
Mars is very different from either of earth or Venus.
It has 1% of the atmosphere as earth, what atmosphere it does have has nearly all CO2, and it only has 1/3rd the gravity. Its surface is constantly blasted by enough solar radiation to effectively sterilize anything on the surface, and the ground is full of toxic salts. I would much rather be in a cloud on Venus than anywhere on the surface of mars.
I was speaking of their proximity in space, sorry for not being clear. Very good info regardless
It was pretty clear to me that you meant spatial proximity.