Time isn't even the biggest problem. It's the radiation. In order to survive beyond the magnetosphere, the walls of the craft need to be thicker than the walls of a nuclear submarine. And then the faster you speed that craft up, they need to become even thicker to protect against higher and higher energy collisions from particle impacts as the velocity increases.
So the larger 'm' gets in F=ma, the larger F needs to be to compensate. To increase the force means increasing the mass by adding fuel, which requires more force to accelerate the added weight of the fuel, which needs more fuel...
With the shielding mass requirements and fuel mass requirements both scaling with velocity, interstellar travel is and always will be impossible. Anyone telling you otherwise is trying to scam you.
Time isn't even the biggest problem. It's the radiation. In order to survive beyond the magnetosphere, the walls of the craft need to be thicker than the walls of a nuclear submarine. And then the faster you speed that craft up, they need to become even thicker to protect against higher and higher energy collisions from particle impacts as the velocity increases.
So the larger 'm' gets in F=ma, the larger F needs to be to compensate. To increase the force means increasing the mass by adding fuel, which requires more force to accelerate the added weight of the fuel, which needs more fuel...
With the shielding mass requirements and fuel mass requirements both scaling with velocity, interstellar travel is and always will be impossible. Anyone telling you otherwise is trying to scam you.