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Remember that in the case of great speeds, Newton law don’t apply with the new(er) concepts of space and time.
Most of the theories/laws were developed under the condition that speed is small. Such as Newton’s second law, Where a constant force acting upon matter for certain...
At the speed of light, your mass is converted into energy.
I honestly don't know. I read it in a magazine somewhere. They were trying to make plasma cold enough to not damage a vessel, but yet extremely hot on the outside. Thus - > "Shield". It could be bs, or not. But it was pretty convincing.
Considering that space is a vacuum, all you need is a little push and a lot of time, and your speed would increase. You wouldn't need to slingshot yourself on other stars gravitational field. But the problem comes that at a certain speed molecules start to separate. So in theory, you, and your...