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This is way out there and it depends on certain developments in science.
First of all, there is an organization called the Alcore Institute that specializes in freezing recently dead people. The idea is if you can freeze someone who's body is first saturated with cryoprotectant, you can minimize the ice crystallization within the cells of the body, including the all important brain. The idea is that someday in the future, we may be able to reverse this process and cure whatever killed the patient in the first place to reanimate him or her and grant the person a second life. What's important to preserve is the cellular patters of the brain, and of course the DNA of the deceased patient so he could later be brought back to life with his memories and personality intact.
Another idea that occurs to me is that it may not be necessary to bring back the person in his original body, its the cellular patters in the brain that is important, the patient doesn't need to be brought back in his original atoms. Mars has plenty of atoms as well, it has enough of the right kind of atoms to replicate a human body, and transmitting information from Earth to Mars is cheap and easy, so long as their is a sufficient receiver to receive that information broadcast from Earth. Also consider that the person to be transmitted to Mars has no chance of dying enroute, since he is already dead, the worst that can happen is that his information doesn't get transmitted correctly. There are a number of error correction schemes that will reduce the chance of errors in transmission. If even after that if the dead person is not transmitted correctly, their is still his original file on Earth that could be compared with what was received on Mars.
Now there is a technique that may be applied, there is some work going on in bioprinting, basically its a 3D printer that prints with stem cells, the idea is that someday we may be able to print human organs using the patient's stem cells, the stem cells are then converted into the necessary tissues to produce the organ required. Now the human body can be thought of as a bunch of human organs put together. So it would be necessary to print a whole human body including the brain and the printer would have to be precise enough to position the brain cells just so to recreate the originals memories and personality, it occurs to me that this process could be done on the planet Mars using Martian material and thus saving on the cost if interplanetary transportation for living humans. The people who died on Earth many decades ago, or the people who have memories of those people wake up on Mars.
What else could be printed on Mars? If you could print a human, you could also print many different life forms as well, including ancient trees, A necessary first step would be to freeze the plant or animal to hold its cells still so its cellular pattern may be scanned and then replicated on Mars. Probably fractal algorithms could create the trees that would be printed with bioprinters using tree cells. I think it would be much easier to print an animal, especially a large one, than it would to be transport a living animal in a spaceship through space. So if we could engineer a wooly mammoth for Mars, we could just print the creature on location, we could also print Polar bears, elks, fish and other creatures, a useful tool for terraforming the planet by the way. Instead of having a planet with saplings, we could have "ancient trees" or at least trees that appear to be ancient, probably first growing under domes.
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