# Can the speed of light be constant and absolute?

Mark44
Mentor
...if you take a mass and accelerate it to the speed of light squared it will give off a huge amount of joules.
The equation ##E = mc^2## has nothing to do with accelerating an object. As already stated, it states the equivalence between the mass of some object at rest and the amount of energy that mass represents.

In any case, it's not physically possible to accelerate an object of any nonzero mass to the speed of light, let alone to the square of this speed. When objects are accelerated to appreciable fractions of the speed of light, their mass increases, which means that an ever larger force is needed to continue accelerating that object.

jbriggs444
Science Advisor
Homework Helper
let alone to the square of this speed
Laymen tend to think that the speed of light is a big number and that squaring it results in a bigger number. It is not so.

Expressed in megaparsecs per second, the speed of light is about 9.7 x 10-15. The square of that speed (in megaparsecs squared per seconds squared) would be some kind of accelerating areal coverage rate at 9.45 x 10-29

Pretty small numbers in those units.

eudo, Dale, russ_watters and 1 other person
davenn
Science Advisor
Gold Member
Haha. Seriously though, why did a visionary guy who loves the universal environment send a piece of redundant trash up there...

because it's a classic and because he could

..space-time cannot tolerate or prohibits motion faster than the speed of light (c) then c squared cannot be achieved, making e=mc2 a false formula?
c2 is a constant of proportionality.
If you set c equal to one, you still have to include it in the formula because of its associated measurement units (L2/T2).

Look up some articles on the Lorentz transform. There are some with excellent explanations of the speed of light and relativity and different frames of reference.