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How Vast is the Cosmos?

Subject Science
Grade Level Grades 9-12


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How big is the universe? Perhaps it's so huge that we can't really comprehend it. Is our entire universe just one in an infinite ensemble of universes? What’s the nature of all reality? Is there meaning behind the cosmos? Is there purpose to the laws that govern it? 

The following videos shed light on the nature of cosmology by focusing on four different points of view held by some of the world’s leading thinkers. Use the ideas covered in these videos as starting points for discussions, critical thinking and debates.

Questions to ask include:

  • How vast is the cosmos?
  • Is the universe infinite?
  • Could there be multiple universes (multiverse)?

Please bookmark the video URLs for quick reference when designing discussions or showing them to your class.

Video URLs

Max Tegmark -

Sean Carroll -

Alan Guth -  

Michio Kaku -


Max Tegmark, Physicist, MIT:

Sean Carroll, Theoretical Physicist, Caltech:

Alan Guth, Physicist, MIT:

Michio Kaku, Physicist, City College of New York:


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