NASA
Nasa Cosmology: The Study of the Universe
Cosmology is the study of the "large scale properties of the universe as a whole." In this set of sites, NASA provides information on the Big Bang Theory in a simplified language. The beginning, evolution, structure, fluctuations and...
Symmetry Magazine
Symmetry Magazine: Explain It in 60 Seconds: Dark Energy
Dark energy, described here, is the ultimate mystery for scientists. It is the force that is causing the expansion of the universe they believe. "Explain It In 60 Seconds" is an article series that aims to summarize in a few paragraphs...
Khan Academy
Khan Academy: Acceleration
Acceleration, an increase in the rate of change, is occurring both in the Universe and in human culture on planet Earth. This article explains these fascinating changes.
CK-12 Foundation
Ck 12: Earth Science: Expansion of the Universe Study Guide
Understand the expansion of the universe using this study guide.