Other
National Research Foundation: How Far? How Big? How Many?
Using light as our measuring stick in space, science site provides all types of fun facts using light years and seconds as a reference.
Other
The Electronic Sky: Light Year
Electronic Sky site provides users with the definition of a light year as well as a light year conversion table.
NASA
Nasa Star Child: Galaxies (Level 1)
This site provides an introduction to galaxies for the younger student, that is divided into 2 levels of understanding. Find out what type of galaxy looks like a giant pinwheel. Audio content included. Good glossary, and a printable...
CK-12 Foundation
Ck 12: Earth Science: Study of Space by the Electromagnetic Spectrum
[Free Registration/Login may be required to access all resource tools.] Overview of the electromagnetic spectrum.
NASA
Nasa Star Child: What Is a Light Year and How Is It Used?
This is a definition and example of how distance is measured in astronomy, such as the distance between our earth and the stars.