Light on stars and planets are conserved, carried by oscillating atoms/matters. Light does not propagate in space. Light induces light instantly through universal repulsion force/levity between masses/matters.

We see the sun is not sunlight traveling through space reaching our eyes but induced light in the atmosphere induces light in our eyes.

Sunlight on earth never can radiate into space, it moves westward around the earth as earth spins.

Energy is conserved, coexisting with matters forever, the universe is stable and immortal, all matters are moving, changing, acting and reacting, forever.