Sofia+-+Wonders+of+Science

WONDER QUESTION: Why is the sky blue?
 * The sky is blue because sunlight collides with oxygen and nitrogen atoms.
 * Nitrogen atoms, like all atoms, are made up of 3 parts: electrons, protons, and neutrons.
 * The sun is made of hot gas.
 * The sun is 93,000,000 miles away from Earth.
 * There are 63,360 inches in a mile.
 * There are 5,280 feet in a mile.
 * The sun is 875,000 miles wide.
 * The sun is 2,000,000,000,000,000,000,000,000,000,000 kilograms!!

http://photography.nationalgeographic.com/photography/photos/earth-and-sky-photo-gallery/#/aurora-borealis-yukon_26429_600x450.jpg