“…Huygens believed that the space is everywhere densely filled with the ether [5], through which light may spread from point to point due to a secondary re-emission of these elements of ether. According to Huygens' ideas, light is a stream of waves distributed in an unknown hypothetical medium called ether, which fills the space everywhere tightly [6,7]. This ether penetrates into objectsair, glass, water, and, of course, it fills the entire vast space between the stars, planets and other celestial bodies.…”