Predict the Solar Cycle The Sun is a constant presence in our life on Earth. It gives us the heat and light we need to survive. But it is not a stable place. The Sun is a ball of hot plasma which is constantly changing. Read more about Predict the Solar Cycle
James Van Allen James Van Allen with a with a rocket and scientific instrument package (Rockoon). Credit: NASA Occupation: Space Scientist Year born: 1914 Read more about James Van Allen