Science Why are globular clusters not considered galaxies? How far apart are their stars, and do their magnetic fields affect each other? Can a cluster’s stars have planets, and would you need sunglasses to travel through one?
Science Seasonal changes in color or contrast on mars were once thought to indicate the presence of vegetation or water. Are there still seasonal changes, and if so, why?
Science, Solar System If our solar system is composed of the remains of stars that used up their hydrogen and went supernova, where did our sun get the hydrogen it began with?
Science, Solar System How is the temperature of the Sun’s surface measured through its much hotter atmosphere, the corona?
