6. Light Years Measure Time
Light years are often used to denote a vast amount of time but in reality, scientists say that they actually measure distance. According to NASA, a light-year is ‘the total distance that a beam of light assuming that it is moving in a straight line travels in the space of one full year’.
The amazing thing is that light travels at a speed of around 3,00,000 kilometers per second, so we can assume that one light-year is actually 10 trillion kilometers in distance. Light is by far the fastest thing that moves in space.