i cant imagine if there was enough fuel for lengthy burn for the craft to reach light speed... ...or could it??
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The faster an object goes, the more fuel it needs to go faster, the more fuel it needs to go faster the more massive the object, the more massive the object the more fuel ... etc.
“The faster an object goes, the more fuel it needs to go faster”
Force = Mass x Acceleration. Speed is not in the equation. In outer space there is no resistance like gravity or friction (Maybe a little gravity). A continuous force creates a continuous acceleration rate. So if you burn the same rate you accelerate the same rate regardless of the speed. When you are going faster, you in fact cover a greater distance with the same amount of fuel because no fuel is used to overcome friction or gravity.
Fuel burn in rockets is measured in mass over time. As you consume fuel the spaceship looses mass. With a steady burn rate the acceleration rate actually increases as the mass decreases. Once you have reached the desired speed, you can cut the engines and coast indefinitely without slowing down.