If you’re teaching astronomy to almost any grade, NASA Science is a site worth checking out. This bright, colorful site is chock full of pictures and features links to pretty nearly any NASA mission that might still be out in space somewhere and operational. That means you get about 10 years worth of missions you can learn about and explore. You can start your learning by studying the earth from space, the sun, the planets, or astrophysics in general.

Of course, as with any site, you have to approach with skepticism. The section on astrophysics suggests you can come in and “discover the origin, structure, and destiny of the Universe.” Now Science can do some grand things, but to teach me the “destiny” of the universe sounds a bit more like philosophy, or religion. What I’m trying to say is that this site, like all sites, has a bias, and you should watch for it as you browse. The kids might not spot it on their own because we’re all taught to believe science unquestioningly.