For a web-based learning to be truly effective it must be interactive. This means that it is not just a reformatted canned lesson of printed worksheets placed on the web. The web-based activity is inquiry-based and incorporates the full features available on the web - interactivity between computer and student. The learning activity must engage student critical thinking skills by using the scientific inquiry process.
A great set of interactive space resources. Learn about day and night, orbits, phases of the moon and more. Choose a topic from the menu and explore with your class.
http://ictmagic.wikispaces.com/Science
Gooru is a free platform for students and teachers to access standards-based online resources in organized "playlists" for learning. Created by a Google employee, it's run by a nonprofit group called Ednovo. Students can access "ClassBooks"-collections of textbooks, videos, and assessments-on any topic, and they can interact with their peers and teachers while studying. Teachers can search for standards-aligned web resources organized into "ClassPlans," which they can customize and share with the larger community. In short, educators can use the site to search and teach, while students can use it to search and study; the website's tagline is "learning is social."