The sky usually looks light blue. But if you went to the top of the highest mountain , went to the top of the highest mountain , where there is less air between you and the sun to scatter the sunlight , the sky would be deep , dark blue. And if you rode in a rocket high above the earth , where there is no air at all to scatter the sunlight , the sky would be so dark that it would be black. Sometimes the sky doesn't look blue. At sunrise and sunset , the light from the sun sometimes is scattered in such a way that you see red , orange , and other colors in the sky.