One of the best tools to help you assess your risk of getting a sunburn is the UV index scale. I’ve come to learn that the UV index is just as important to pay attention to as any other part of the weather forecast on TV or online. But what, exactly, is the UV index scale […]
As the outer layer of our atmosphere, the exosphere is a relatively mysterious place between the atmosphere and outer space. Find out how high up it is, how scientists tell where outer space really begins, and more fun facts.