How Many Galaxies Are There?

Could there really be over 200 billion galaxies? It turns out the number may be closer to two trillion galaxies! A video presentation discusses the existence of galaxies in the universe. The narrator explains how scientists make their estimates and why the number is ever changing.

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CCSS: Adaptable
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Instructional Ideas
  • Ask learners to record notes on the progression of the theory on the number of galaxies
  • Have pupils defend each theory on the number of galaxies using evidence from the video and provided resources
Classroom Considerations
  • Expects a basic understanding of the function of infrared telescopes
  • One part of a larger SciShow Space series
  • Provides actual telescope images to support the data
  • Includes reference to additional videos for further learning
  • None