OK...I'll admit that I have failed chemistry 3 times and in an odd way I am proud of that fact, so I need
in getting an answer to the following query.
What is the weight of an atom of gold's nuclei and therefore, what would be the energy required to push that nuclei along at the speed of light?
If my memory serves me...the closer an object gets to the speed of light, its mass increases towards the infinite and therefore an infinite amount of energy is required to give it thrust.
Something in that article does ring true to me. But I'd be more than happy to be proved incorrect.
Peter.