Colors mean a lot

You might think that explaining why the sky is blue would be kind of a simple thing. But even a brief explanation of it requires a lot of science. The colors of everything we see are produced in different ways. Some of those colors are explained with physics, others by the own field of chemistry. The nitrogen and oxygen that we are breathing in the air are made up of very small particles called molecules. A molecule of nitrogen or oxygen is really so small. Each molecule is only about 0.4 nanometers, or 16 billionths of an inch. It would take 250,000 nitrogen molecules to equal the width of one strand of your hair. You can think of the molecules as behaving like very tiny balls that constantly bounce around. When sunlight travels through the atmosphere, it passes between lots of those teensy nitrogen and oxygen molecules. Sometimes the light runs right into one of them. So the sky looks blue because the blue portion of sunlight is much more likely to bounce off the molecules in th...