We've been using the gravitational forces of objects like planets and moons to sling-shot our crafts to greater speeds. This allows us to take much less time to get to the outer solar system. This method doesn't seem like it would work at higher speeds. What mechanisms would it take, theoretically of course, to reach light speed.
No object with any mass could ever actually reach light speed (but it could get really, really close). To get close to light speed, any set up where you have constant thrust will eventually get you going very fast - only problem is you run out of fuel.
One proposed system to get around the fuel problem is a hydrogen ramscoop. Basically you have a very large funnel on the front of your ship, which collects the very disperse interstellar hydrogen present throughout the universe - once you are going fast enough you actually collect a large amount of fuel this way. Then you run a fusion reaction and use the resulting thrust to keep going faster.
The funnel would probably have to be made out of magnetic fields rather than solid material because of potential impact danger.
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