How many different directions does the Earth move in space?
• How do we know the speed of the Earth? • Why is the sky blue? • How is the mass of the Earth determined? • Are there differences in gravity from one place on the Earth to another? • Why is the Earth tectonically active and not Mars or Venus? • Over a 10 kilometer run, how high is the Earth’s curvature at the mid- point? • How is the Earth-Sun distance determined? • If the universe is mostly hydrogen and helium, why isn’t the Earth composed the same way? • Is the Earth’s atmosphere thicker at the equator due to rotation? • Where can I get info about the amount of oxygen in the atmosphere at various altitudes? • What are ‘red lightning’ or ‘sprites’ seen in thunderstorms? • What causes auroras to have different colors? • Is it true that the Earth’s magnetosphere is expanding? • Where can I get information about the Earth’s magnetosphere? • Is the Earth’s magnetic field changing? • Is the Earth about to reverse its magnetic field? • What is the South Atlantic Anomaly? • Why don’t aurora
