Question

why does light defy the laws of thermodynamics?

it moves on for ever, it dose infinite work without a constant energy supply. why?

Answer 1

Pioneer 10, a man-made object, was launched in March 1972. It's currently travelling at 12.5 kilometers per second in the outer space, after having escaped the Solar System. Unless something stops it, it will travel forever in this galaxy.


Same applies for light.

In an inertial reference frame, an object either remains at rest or continues to move at a constant velocity, unless acted upon by a force.

There is no friction in space. There are no forces opposing motion. Therefore, not only light, but any object, can travel indefinitely.

The Second Law of Thermodynamics requires that entropy stay the same or increase. Light travelling without interacting is a process for which entropy is a constant.

Perpetual motion machines generally refer to systems from which we can extract usable work without inputting any energy. In the example of light propagation in vacuum, the light isn't outputting any work while travelling through space.

Hope this helps :)