NASA is one of my favorite resources as a science teacher. They have tons of resources, websites, and more for educators to use in their classrooms.
Solar System Exploration is another great resource from NASA. The site has a variety of resources about our solar system including news, information about each planet, NASA missions about our solar system, multimedia resources, information on spacecraft and technology and the people who explore the solar system.
This is a great resource for anyone who teaches science or teaches about our solar system.