Texas Education Agency
Texas Gateway: What Is the Universe?
The following tutorial is an explanation of what the universe is composed of.
Georgia State University
Georgia State University: Hyper Physics: Red Giants
Describes the red giant star's development stages and the scenario of our sun as a red giant. Diagrams are used to present the information.
Other
Stat Soft: Statistics Glossary
Dozens of statistical terms are defined and illustrated in this glossary.