#17: The Meaning Behind Airplane Lights
If you look up at the night sky, you might see little red and green lights flying across. These lights are from airplanes, and although they look pretty, they are not used for decoration. With this chart, we can understand why different colored lights are used. The lights help airplanes understand the positions of other flying aircrafts.
For example, if a pilot sees a green light on the left, and a red light on the right, they know another plane is coming right at them. This is a really smart system if you think about it, which helps to avoid plane crashes at night when visibility is low. There are thousands of commercial planes in the sky at any given moment, so this comes in pretty handy for pilots!