Why is the sky blue? Written by Savanna Choak Does it look blue to all animals? introduction The sky is everything that lies above the surface of the Earth, including the atmosphere and outer space. In the field of astronomy, the sky is also called the celestial sphere. This is viewed from Earth's surface as an imaginary dome where the sun, stars, planets, and the moon are seen to be traveling. constellations. Usually, the term sky is used informally as the point of view from the Earth's surface; however, the meaning and usage can vary. In some cases, such as in discussing the weather, the sky refers to only the lower, more dense portions of the at. The sky is blue Butterfly's peacefully flying in the sky. Diagram for what is the sky. Thick clouds Blue sky different shades of blue The sky can be Red, Orange, white for when it is misty, pink for the sunset. conclusion Conclusively, the sky is everything that lies above the surface of the Earth. The sky is called Celestial Sphere. A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.