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My limited understanding is that there is no friction in space, and if you apply thrust in space, the longer you have thrust, the faster you go. Therefore, why isn't it possible, with enough fuel, anyway, to reach extraordinary speeds?
The universe is made up of fields.
One such field gives things mass.
As you accelerate, the field giving things mass pushes back on the object more and more so you need more and more energy to go faster.
It's like walking through sand or water. When you go slow, you barely feel it. As you go faster, the drag increases.
The mass-field is itself a form of drag or friction, and it's a property of the universe itself.
To go light speed we'd need a way to detach particles from the mass field but we don't even know theoretically how to do that.
(The real name of the mass field is Higgs Field and proving its existence is the reason CERN was built).
PS: In actuality, 70% Light speed (called effective light speed) would be enough. We have theoretical means of attaining that.
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