*Bigd asked the Naked Scientists:*

I have a question that might be to difficult to answer easily.

I have just begun to understand the theory of relativity and I would like to see if I have it right. ENERGY EQUALS MASS TIMES THE SPEED OF LIGHT SQUARED. As a formula, energy, mass, and the speed of light values depend on each other, right? If I understand it right we can never go as fast as the speed of light because the speed is a constant, that leaves energy and mass, these are variables.

As you use energy you can't supply more mass to make the formula work. So isn't light energy, which means for it to maintain its constant speed it must need to replace mass. I am either way off base or just misunderstanding the principals involved. I just have a curiosity to try to understand this, if you think you can help me please do, my curiosity is peaked.

Thank you.

Darryl

*What do you think?*