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Video library

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Crash Course
No content specifically designed for students with special needs

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Grade Levels:

10, 11, 12, 9, High school

Subject Areas:

Natural Sciences, science

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Active galaxies pour out lots of energy, due to their central supermassive black holes gobbling down matter. Galaxies tend not to be loners, but instead exist in smaller groups and larger clusters. Our Milky Way is part of the Local Group, and will one day collide with the Andromeda galaxy. Clusters of galaxies also clump together to form superclusters, the largest structures in the Universe. In total, there are hundreds of billions of galaxies in the Universe.