How long have auroras been observed?

• Is there a greater risk for solar radiation when taking the polar route by jet plane? • Is plasma present during an aurora? • Is it true that organic matter cannot pass through the van Allen radiation belts? • Did the Earth gain a new van Allen radiation belt in 1998? • Where is the biggest difference between true north and magnetic north? • What is the strongest magnetic field ever known? • Do animals really use magnetism in any interesting way to navigate? • Do magnets loose their magnetism in space when they are outside the earth's magnetosphere? • Is there a monument to the Northern Lights somewhere? • How much power do aurora produce and can we use it? • When do auroras occur? • What effects do auroras have on the Earth? • How hot do auroras get? • Did the asteroid that hit the Earth 65 million years ago affect the Earth's orbit? • Could intelligent life have existed on Earth a billion years ago? • Is the Earth really shrinking? • How do you think the Earth will finally come ...  more