Is it because they are there? (Interstellar travel)
People have highly motive to research the vehicles, which can probably use sometimes in the future for interstellar travel. And there is one little problem with that kind of project, which is how we argument that thing for people, who give money to those programs. The thing in those missions is that the target must be really interesting, like Earth-like planet.
But if those planets have intelligent lifeforms, that thing would cause hostile actions against our planet. And if we would want to get data from that solar system, the flyby mission would be too limited, and the probe should turn to the orbital trajectory, but that would require complicated technology. There is a possibility, that those planets would be hot and rocky worlds, where is no water, and those objects we can search by using telescopes. And what if we find aliens, well let's say that we hope that we will find them and at the same time that we will not find those mysterious creatures.
And this is one of the greatest problems with the interstellar spacecraft. The other main question in those trips is that those journeys would be one-way trips to distant stars, and if those automatized probes would just make a flyby of those solar systems, that thing might cause one little question: what we simply forget that spacecraft during the journey.
If the trip to some stars would take about 200-500 years, that thing is a long time and the thing is that there are many generations between that enormous spacecraft and humans, who send it to journey. And that thing makes possible that we just even remember, that spacecraft is left. So all work that is done would be for nothing.
The size and price of the interstellar spacecraft would be very high. That means that there must be some kind of benefit about those flights. And in some horrifying scenarios the probe, what is sent from Earth to another solar system, because there is Eart-like planet, would just accidentally collide with that planet. The reason could be the error in controlling computers or the software, which controls the flight, and that causes a huge explosion.
And in the worst case the war of worlds. If we would create the spacecraft, what would travel to planet Jupiter and back, the time of that journey is long, and the crew would spend the long term of their life in the space. That journey is complicated enough, but if we would like to create the base to another planet, that thing would be more complicated, because there might be earthquakes and other kinds of things, which might cause problems in those cases.
The realistic choice of those bases is that there would live only the researchers and some other highly-trained specialists. If we think of mass colonization to other planets, we might do that kind of plan if Earth would be somehow destroyed or somehow turn to inhabitable. And force to leave is a little bit different than voluntary colonization.
But if we would think that ordinary people can move to the other planets, that thing could be possible only in the distant future. If we think that we would send a spacecraft to the other solar system, we must realize, that we would be lost the crew, what leaves to that journey. They would ever come back, and that thing would put breaks in that kind of plan. The only realistic version of the craft would be an unmanned probe, which is controlled by artificial intelligence.
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