How Do You Measure the Size of the Universe?

The video explores the vastness of the universe, focusing on astronomical distances measured in light years. It explains the concept of the observable universe, which is about 90 billion light years in diameter, and how space expansion affects our perception of distance. The video introduces the concept of cosmological redshift, which helps measure the universe's expansion history. By understanding redshift, scientists can determine the universe's size and age, estimated at 13.8 billion years. The video uses the analogy of raisin bread to illustrate space expansion and discusses the challenges in measuring the universe's size due to variable expansion rates.

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