PBS
Pbs Learning Media: Relativity and the Cosmos
This illustrated essay from the NOVA Web site introduces the basic concepts of Einstein's General Theory of Relativity and what we know about cosmology as a result.
National Science Foundation
National Science Foundation: Astronomy and Space: Research Overview
Explore some of our most fundamental questions about space exploration with this research overview collected by scientists at the National Science Foundation. Additionally, experience deep space first-hand with telescope interactives.
Khan Academy
Khan Academy: Gallery: How Did Our Understanding of the Universe Change?
Understand how our view of cosmology has evolved by looking through different views of the Universe and zoom in on the light from distant stars on this site.
Curated OER
Science Kids: Science Images: Universe Timeline
This diagram shows a universe timeline as suggested by many scientists and theoretical physics experts. This popular timeline of the universe has different stages which include: quantum fluctuations, inflation, dark ages, first stars,...