Did you know that nothing we see in the Universe is in real time? Or have you ever wondered why the Sun looks bigger than the other stars? Is a light-year a unit of measurement? And then, how tall is a light-year? The speed of light, its measurement and the concept of light years are terms that many people do not understand very clearly. That is why in "Clear Skies" they have taken the challenge of explaining this topic that seems so complicated, in a minute!