what prevents light from being constant?

Answer 1

Light is made up of particles called photons. Photons work like anything else that has mass, and cannot occupy the same space as other objects having mass. Glass and other tranlucent objects don't really count, because of the way they are made photons travel in between the molecules that make up the glass but the photons never travel through the molecules, just around them. But if an object is opaque (light can't pass through) and gets into the way of light, the movement of the light stops.

There is also a theory in quantum physics (I won't get into it, too much space required for fully explaining the theory) but the theory says there are millions of other universes that can interact with our own (mainly though speed is required so only light right now can interact in all universes in this theory) and light in other universes sometimes affects light in this universe and vice versa. But this is a theory and while there is some proof, it isn't absolute that there are other universes.

Answer 2

This is a vague question.

Light travels at a constant speed. But, light can be reflected, refracted, bent by gravity, absorbed, conveted into energy by plants and photo-voltaic cells (absorbed), made faint by distance, turned into laser.

Prevent light from being constant? I can't really understand the question

Answer 3

Chuck Norris.

Answer 4

Shadows, low line voltage, dimmer switches, clouds, sunglasses, wide brim hats!

Answer 5

Refraction and airborne particles.

Answer 6

light is a constant.
light year - 5.88 trillion milles.