Curated OER
Groups, Clusters and Individuals
In this galaxies, clusters and planets worksheet, students solve 5 problems including determining sunspot groups on the sun in a particular day, finding the number of individual galaxies present, determining the number of stars in...
Ministerio de Educación (Spain)
Ministerio De Educacion: Las Galaxias Modulo Vii Unidad 2
In this module you can learn about galaxies, their morphology classification, masses, distances, etc.
California Institute of Technology
Spitzer Space Telescope: Galaxies Gather
Under the heading, "Galaxies Gather at Great Distances" this site examines (and discusses) an image featuring a group and cluster of galaxies. The text goes on to describe details specific to the image.