Better to use O'Neil Cylinders that can be used as a long term living and construction facilities with artificial gravity. We need to start with one big enough to be used as a space hanger. The biggest cost (and danger) of space travel is getting off a planet. Planets are so volatile and unstable, we should not even waste time and money on them. Mars is cool, but will never make a good living place and moons are only good for mining. Even if we invent Star Trek Level propulsion systems, planets will still only be good for tourism. (scenic views) Also, large space stations will eventually be needed for populations to escape planetary disasters, such as moon sized asteroids and nearby supernovas. Even our own sun is going to destroy earth eventually.
Space stations will require less resource and presumably money to build. However, the risks are higher due to meteorite impact, loss of atmosphere and temperature control. Planet terraforming would be hugely expensive, but once done the atmosphere would provide protection from all these threats. So we may have hundreds of space colonies in the solar system before Mars is terraformed.
@@LogicAndReason2025 Mars has about 1/3 the gravity of Earth, which means that to achieve a 1 bar air pressure at the surface it would need a much thicker atmosphere than Earth. This on its own would provide some protection against radiation. It might be possible to add a magnetic shield generator between Mars and the Sun which would help reduce the damaging effects of solar mass ejections, but it wouldn't be of much help with cosmic radiation. Also space stations will always be more vulnerable to radiation than planets because of the amount of shielding possible.
@@charlesjoynson7758 Very interesting. I guess what you mean by a planet having more shielding, would be by having habitation deep underground? I thought that the O'Neil cylinder used the hull to store water and above that, soil that would provide some shielding. Plus, given the configuration of the OC, the hull could be many feet thick with many different materials for shielding and meteor impact protection. Perhaps even an outer layer of some material that could stretch a little. Like a catcher's glove for meteors. Much like sand on a planet surface. Perhaps even a thick gel like substance with something like lead mixed in for added radiation protection. Worst case, it may be that genetic engineering humans to be less fragile might be the only way to live off planet.
Since the slow but steady expansion of our Star will work against such massive efforts, perhaps it would be wiser to work with the outer moons and planets which would have the benefit of becoming more habitable as our Star expands and also give us more time. that said, if it absolutely had to be done you give some very thoughtful paths towards terraforming a hot planet. Perhaps technological breakthroughs and or the advancement of artificial intelligence and robotics will expedite such endeavors in the future.
Thanks for your reply Randy. Terraforming Venus is likely to take place in the coming 10,000 years. That gives us plenty of time to use the planet's atmospheric resources. The expansion of our star will happen, but in hundreds of millions of years. By then our descendants will probably all over our galaxy.
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Could life from earth already somehow spread to other parts of our solar system? Like via an asteroid chunk or satellite or something else somehow? I wonder if it might become harder to tell if life has a truly different origin the longer we are around.
That’s correct Salem. However it would be much harder for an asteroid to get to the outer solar system than the inner. So we far more likely to find earth life on Mars than on the outer solar system moons. Another point is that once it’s actually arrived, either on earth or on Mars, it would start to mutate and would evolve differences, although it would still share DNA with us.
Some of them are metal rich, so we'll need them for our technology. Together all the asteroids in the belt make up just 4% of our moon's mass, so they may not be enough. But it depends on the technology our descendants have at their disposal and how powerful their rocket engines are.
@@charlesjoynson7758 Wow, I had no idea the volume of asteroids was actually that small. Honestly, I thought there was another planet worth of asteroids out there, lol.
