Hubble Trivia: 17) How wide is Hubble’s primary mirror?

The video discusses an 8-foot parabolic mirror, highlighting its power and size. It then explores the capabilities of the Hubble telescope, which can observe up to 800 million years after the universe's expansion began.

What time period does the Hubble telescope allow us to see back to?

What event marks the beginning of the time period mentioned in the text?