Problem
Watching sunspots move across the disk of the Sun is one way to show that our star rotates on its axis. Can you come up with other ways to show the Sun's rotation?
Suppose in the future, we are able to forecast space weather as well as we forecast weather on Earth. And suppose we have a few days of warning that a big solar storm is coming that will overload Earth's magnetosphere with charged particles and send more ultraviolet and X-rays toward our planet. Discuss what steps we might take to protect our civilization?