Light waves a cycling motion like waves in the ocean. But unlike ocean waves, which travel through water, light waves travel through empty space. When a star emits a light wave, the wave can travel across empty space to Earth, where we see the star's light.
Light waves a cycling motion like waves in the ocean. But unlike ocean waves, which travel through water, light waves travel through empty space. When a star emits a light wave, the wave can travel across empty space to Earth, where we see the star's light.