Learn about how Earth orbits the sun and how satellites orbit the Earth. Discover the different types of satellites such as GOES and POES and what they are used to monitor.

This site from NASA helps in explaining a barycenter. "In the case of the Earth and the Sun, both bodies actually revolve, or spin, around the center of the mass between them. This point is called the barycenter."

After listening to excerpts from four of the violin concertos from "The Four Seasons" by Italian composer and violinist, Antonio Vivaldi, decide which excerpt was meant to go with which season, and also decide where the earth would be in...

The planet Mercury is profiled with information about its size, mass, atmosphere, length of day, and the like. Features include interactive activities and learning exercises.

This site from the Astronomy Department of Cornell University provides brief introduction to both solar and lunar eclipses. Links are provided for pictures and charts of the eclipses, and this is a good site to check out on the subject.

A wealth of facts await you on this complete site. Topics include size, mass and gravity, length of day, orbit, distance from the sun, and more. A coloring page, quiz, fill-in-the-blanks activity, and interactive puzzle will challenge...