Why is the sky blue? - Sunlight reaches Earth's atmosphere and is scattered in all directions by all the gases and particles in the air. Blue light is scattered more than the other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time., How much does the earth weigh? - The earth weighs 13,170,000,000,000,000,000,000,000 pounds. You can say this number like this: 13 octillion, 170 septillion. That’s A LOT more than a million, billion, or trillion pounds!, How far away is the sun? - The sun is 93 million miles away from the earth. Even light, which travels so quickly that we cannot even see it move, takes eight minutes to get from the sun to earth., How do airplanes fly? - There are different forces (pushes and pulls) that make flight possible. Lift is caused by the variation in air pressure w, How do flies walk on the ceiling? - Flies can walk upside down! They can do this because of their sticky feet., Why can I see the moon during the day? - The moon looks bright at night because of light from the sun reflecting off the moon’s surface. The sun always lights up half of the moon., Why do birds fly south for the winter? - Many birds fly south in the winter. Birds that eat nectar or insects will not be able to find food in areas that have cold winters.,

Science Questions: Explaining the Universe

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