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It is even more complex than we all think. We are an integral part of our biosphere. Without it we would atrophy as a species.
All human life ultimately relies on other life from plants down to the microscopic life all around us. The web of symbiosis not fully understood.
If we could transplant say a thousand chosen humans to another 'inhabitable' planet they would die eventually as not all the organisms that they rely on for good health went as well.
There is nothing wrong with conjecture. In my opinion it is a distraction from the damage we are ALL doing to our Spaceship Earth.
We have nowhere to go. Better we look after the life support systems at home before we try to emulate them for a four hundred thousand year journey.
Even if we had the technolgy to freeze/unfreeze a complete human. Would you like to wake up after hundreds if not thousands of years of accumulated radiation and watch your body once thawed out show all the effects of a massive lethal radiation dose.
The people who had their bodies frozen and even more macabre just their heads are all going to have this problem. Just do the numbers of the background radiation we all live in let alone in outer space. Our repair systems can cope with these low levels in real time but not cumulative.
A last thought. Even if time travel were possible how would you navigate spatially. The Earth rotates goes around the Sun goes around the Galaxy is moving etc. Where were you even ten minutes ago relative to the 'fixed' Quasars.
Bert
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