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.

Concepts

galaxies, the milky way galaxy, space, the universe, the hubble telescope, telescopes

Show More Show Less

Additional Tags

science

Show More Show Less

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
  

• This video is hosted on YouTube

Pros

• Provides actual telescope images to support the data
• Includes reference to additional videos for further learning

Cons

• None

Common Core

SL.9-10.2 SL.11-12.2 RST.9-10.7 RST.11-12.7