Light has nothing to do with mass. Also note that mass is the resistance of a body to a change in motion.
light
light and shadow
Yes - there are many different types of energy.
Because without it there is no light side.
Both light and heat are fundamental to life. Without either one we would not exist
Yes, it is true; no atoms of the elements in the light.
Gravity exists regardless of weight, as it is a force of attraction between objects with mass. Weight, on the other hand, is the force with which an object is pulled by gravity, and it depends on the mass of the object and the strength of the gravitational field it is in. So, gravity would still exist even if weight did not.
Portholes are small round windows in the huls of ships that let in light and air. Castles are defensive structures common in the middle ages. Both can and will exist without you.
Yes, energy can exist without matter. Energy is a distinct concept from matter and can exist in various forms such as light, heat, motion, or sound. In the absence of matter, energy can still propagate and interact with its surroundings.
Of course,energy forms like Light,sound do not have any connection with gravity.
Light can exist without sound. A fluorescent light is an example of this. But yes, light can exist before sound. Light and sound are created simultaneously by something like lightning. It's just that the light is propagated much faster than the sound. We all know that we see the flash of lightning before we hear the sound it makes, and we can "calculate" the distance to the bolt by simple mathematical means.
A particle without mass is called a massless particle. Massless particles travel at the speed of light and do not experience gravitational forces. They have energy and momentum, but no rest mass. Examples of massless particles include photons (particles of light) and gluons (particles that mediate the strong nuclear force).