Imagine a world without light bulbs. Once the sunset, you would have to go to bed, and when it rose again, you would wake up. We owe a lot to artificial light. Because of it, we can see in places light normally wouldn't reach, such as in caves and deep under the ocean surface. However, it is also hurting us. Light pollution is affecting our health, the study of astronomy, and the mating patterns of animals.

How does it affect animals? Night creatures are genetically programmed to navigate by light from reflected from the moon and stars. It is estimated that 100 million birds in the United States fly into buildings every year due to confusion involving light pollution. Light pollution is a leading cause in the decline in the Giant silk moth population. It alters migration routes for many moth populations and artificial light affects water creatures by...