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 auroras happen near the equator? • How do auroras affect the Earth? • How are auroras produced? • If auroras didn’t exist how would the Earth be affected? • Do aurora give off heat? • Will there be a ‘restructuring’ of the Earth’s magnetic field in the year 2013 that will end the Earth? • How much mass does the Earth gain from the solar wind? • What effects do sunspots ha
