Jet planes often fly in the lower Stratosphere to avoid bad weather in the Troposphere. Ozone is a molecule made of three oxygen atoms. The oxygen molecule we need to breathe contains two oxygen atoms. The increase is caused by the absorption of UV radiation by the oxygen and ozone. Exosphere -Extends beyond the Thermosphere hundreds of kilometers, gradually fading into interstellar space.
Light is a kind of energy that can travel through space.
Light from the sun or a light bulb looks white, but it is really a mixture of many colors. The colors in white light are red, orange, yellow, green, blue and violet. You can see these colors when you look at a rainbow in the sky. The sky is filled with air. Air is a mixture of tiny gas molecules and small bits of solid stuff, like dust.