Curated OER
Parallax
Students discover how astronomers used the diameter of the Earth's orbit around the Sun as a baseline for estimating the distance of some stars, and the meaning of "Parsec" and "light year."
Georgia Department of Education
Ga Virtual Learning: Galaxies, the Milky Way and Beyond
In this interactive tutorial students will explore galaxies. Learn what the Milky Way Galaxy is like, how various galaxies are grouped into clusters and superclusters and why those particular galaxies clump together.