And I know where you are in the sky right now, too! Let me listen to your signal to figure out how far away I am from each of you… Oh! I must be right here! There’s no other place that is the right distance away from each of you! OK, let me check the internet to see what pizza places are near me…” And all that happens in an instant. Why Are Planets Round? And how round are they? explore Why Is the Sky Blue? Learn the answer and impress your friends! explore Why Does the Moon Have Craters? It's not because the Moon gets hit by meteors more often. explore Why does Saturn have rings? And what are they made of? explore Why is sixteen so sweet? What kind of math would creatures with 16 fingers invent? explore Why did it take. Turn an old CD into Saturn's rings. If you can find an unwanted CD or DVD, you can make your own jewel in the sky! Saturn is almost everybody's favorite alien planet. You can make a lovely model of Saturn and her rings. You can hang your model Saturn from the ceiling and watch it gracefully turn with the air currents. Or your Saturn will make a beautiful holiday decoration. For each Saturn. Oxygen gives off green and red light. Nitrogen glows blue and purple. These green bands of light in the winter sky above Alaska are an aurora borealis. This is the name for an aurora in the Northern Hemisphere. Credit: Sarah Histand Do other planets get auroras? They sure do! Auroras are not just something that happen on Earth. Why Is the Sky Blue? The Short Answer: 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. Credit: NASA/JPL-Caltech Explore the Magic Windows of the electromagnetic spectrum below! Radio Waves Credit: NASA/JPL-Caltech Radio waves are very long and not very energetic. Radio waves can be from about the length of a football field up to 100 kilometers (60 miles) and more. Here we see a quasar (for quasi-stellar object ) through the Magic Radio Window. Quasars look a bit like stars. The air molecules from Earth's atmosphere scatter out most of the blue light. The remaining light reflects onto the Moon's surface with a red glow, making the Moon appear red in the night sky. The name blood moon is also sometimes used for a Moon that appears reddish because of dust, smoke or haze in the sky. When you feel the wind on your face, see clouds in the sky, and watch a bird flap its wings in flight, you’re experiencing the troposphere. It’s a pretty nice layer to call home. The blue arrows show how cool, dry air sinks in the eye and between the bands of clouds. The large red arrows show the rotation of the rising bands of clouds. When the winds in the rotating storm reach 39 mph, the storm is called a tropical storm. And when the wind speeds reach 74 mph, the storm is officially a tropical cyclone, or hurricane. Answer your questions: What is the atmosphere? How much water is on Earth? Why is the sky blue? How far away is the Moon? Games Crafts.