Other
Space Science Institute: Alien Earths: Planet Quest
New technologies are continually being developed to help us look deeper into space to discover new planets and to search for other intelligent life forms. Learn about some of these initiatives here.
CK-12 Foundation
Ck 12: Physical Science: Wave Frequency
[Free Registration/Login may be required to access all resource tools.] Definition of wave frequency and how it is related to the energy of a wave.
Other
Arab Physics
While some of the pages on this site have yet to be filled, the pages that are complete are comprehensive. For example, pages on friction, heat, and the Doppler effect are illustrated and explain relevant formulas. A biography page...
Bill Nye
Bill Nye: My How Time Flies
Try this at-home science experiment to learn about the Doppler Effect.
ACT360 Media
Act Den: Sky Den
This journey will help you solve big questions about the universe. You will be able to see beyond human capabilities and will learn what scientists are discovering.