Kimmo Huosionmaa
If we are speaking of electric rocket engine what uses radio-waves to push rocket throw universe, we must say that rocket doesn't break any natural laws. Radio-waves, electrons, and photons can give spacecraft engine impulse what is 300 000 kilometers per second, but force what throws motor forward is so tiny, that this kind of motors is only absurd way to travel in the universe. If we will use radio- or photon rocket alone, it could take even thousands of years to obtain the speed of light.
So little is pulling force of this kind of machine. In this motor radio- or microwaves will transmit to rockets combustion chamber and it will push rocket forward. This radio-rocket is one way to build a rocket which exhausting gases obtain a speed of light. Only radio-wave or radio-signal or photon or light itself can obtain cosmic speed limit 300 000 km/s.
Scientists and engineers have spent a lot of time to think what kind of machine would this kind of rocket what can travel at speed of light. So they think that this kind of rocket uses many types of the rocket to obtain that marvelous speed. First, it might use nuclear fusion to accelerate itself near the speed of light. The fusion motor is assisted by fission reactor, what uses laser-system. These lasers keep fusion stable, and fuel would take from the universe.
Giant magnetic fields suck ions to fusion, what is actually a star what burns outside of the ship. Nuclear particles what are the basis of this reaction will push spaceship throw the sky. And when this more powerful motor will accelerate spacecraft to speed what is about 75-85% speed of light, will photon rocket or electromagnetic-rocket start.
With this system, spacecraft will theoretically obtain a speed of light. And if this is possible will it make travel to other stars possible. As Einstein's theory of relativity says time will stop in the ship when it travels speed of light. But of course, time continues to march outside the spacecraft. And if travel to some other star takes 65 years, if a distance of star is 65 light years. So travel time to star and back will be 130 years, and that's why a trip to that system would be one way. The crew of ship won't getting older, but their friends at Earth would be 130 years elder. That is a major problem of interstellar spaceflight.
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