Quote Originally Posted by drewmandan View Post
My point is that to reach any arbitrary fraction of c requires a finite amount of energy. Getting to 0.9999c requires certain energy, and getting to 0.999999c requires more, but also a certain amount. Now where you draw the line between "a lot" and "too much" depends on your power source, ship design, etc.




Yes, but then you must include the momentum of the reaction mass used to reach said relativistic velocity. The momentum of the ship alone is then not a closed system and does increase.



No, mass is invariant. Momentum is given by gamma_u*m*v, where gamma_u is the Lorentz factor, m is invariant mass, and v is velocity.



All your points were incorrect.
I suggest you educate yourself, if you can:
Mass in the equation you are quoting isn't defined as 'invariant mass', it is defined as rest mass.

None of my points were incorrect, and I've had too much education on the subject for wikipedia to be any use to me. I suggest you try looking for better reference besides open source free internet websites.