I probably have the wrong idea, but we learn by asking I guess. I just microwaved some pizza and while doing so I remembered that microwaves are electromagnetic radiation. I then got to thinking that microwaves work by using a frequency of light that interacts with the water molecules in the food. I then started to wonder something. Say I got bored in the middle of heating my food and zoomed off in a spaceship. In space I pass my microwave again. From the point of view of the microwave it's functioning liek it does on earth. Dielectric heating of water molecules in my pizza. Light energy going from the magnatron and being converted to thermal energy in the food. Drop in energy for the microwave, gain in energy for the pizza. Because We're passing at near the speed of light the waves that the microwave are emitting have been doppler shifted, so I assume I'm going to see something different because of a thought experiment with a similar setup where an object emits a flash of light and from two different perspectives you see a change in mass and kinetic energy between them for the object. Problem is that I don't really understand it so I can't think whats' going on here. What would the moving observer see?