Skhadov thrusters and Nicoll-Dyson beams
1) Skhadov thrusters the one hypothetical way to travel between stars.
Skhadov thrusters are one of the hypothetical megastructures, which allows entire civilization to move in the space. The idea is similar to the fusion rocket, but the scale of this kind of vehicle would be enormous because it would close natural star inside its structure, and then the star would make this giant spacecraft, what would be bigger than Earth travel in the space. The thing, what differences the Skhadov thrusters from the normal-size fusion craft is that this thing would use a natural star as the power source.
The star would be captured in the giant structure, what would look like a sail and the front side of this kind of thing would be used as the layer, what would be moved by the solar wind, what comes from that star. And the star would hang under the layer by using the high-energy magnetic field. This thing would look "easy to make", but if some civilization would make this thing it would need the enormous-scale technology because capturing G2-type star would be a really difficult process even for the civilization, what is in the Kardachev scale II(1).
M1 type red dwarf could be easier to capture, and that thing would need less large-scale technology than capturing the star, which has the size of the sun. But if some civilization would have the ability to create this kind of thing, it would make an impression on everybody, who sees that kind of thing.
Maybe some civilizations would make this kind of structure when they must leave their solar system. There is a possibility that they could create an artificially made star in the focus of the parabolic layer by using the energy of their red giant. And if they are really good mathematicians those hypothetical aliens would use the supernova of their center star for giving thrust to that giant space system.
2) This kind of megastructures can also create Nicoll-Dyson beams for communication, sending probes and making death rays.
And this kind of megastructures is extremely dangerous. The thing is that Skhadov thrusters would also be used as weapons, which makes the "Death Star" seem like some pathetic attempt to make an impression to something like primitive villains. The Skhadov thruster can also create the death ray, where the power of the entire star would turn to laser ray.
In this case, the parabolic structure would turn to the giant mirror, which is aiming the light of the star in the large laser element. That power can vaporize entire stars, and in this case, the Skhadov thruster can be used like ancient Greeks used the parabolic mirror, and turn the radiation of the star in one point. Or it can use collect the radiation to the laser-element, as I just wrote. It can use that ray as the "death ray", but there can be another kind of purposes. That giant structure can also send space probes and send messages through the universe by using the enormous energy levels.
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