Re: Light??
When an object travels faster, the more massive it becomes, and it needs an equal amount of energy to push it along. But, at about three-quarters the speed of light, an object has infinite mass, so it needs infinite energy to travel, and it is impossible to have infinite energy, because energy can never be created or destroyed. All the energy in the universe would nowhere be enough to make an object travel at the speed of light.
So the fact that light and other electromagnetic waves, such as microwaves, DO travel at the speed of light means that they have no mass, as so need no energy to move them.
When an object travels faster, the more massive it becomes, and it needs an equal amount of energy to push it along. But, at about three-quarters the speed of light, an object has infinite mass, so it needs infinite energy to travel, and it is impossible to have infinite energy, because energy can never be created or destroyed. All the energy in the universe would nowhere be enough to make an object travel at the speed of light.
So the fact that light and other electromagnetic waves, such as microwaves, DO travel at the speed of light means that they have no mass, as so need no energy to move them.