Is the Universe Infinite or Finite? - Understanding Space, Expansion, and Cosmic Structure

Explore fundamental questions about the nature and extent of our universe in this 13-minute physics lecture. Delve into complex cosmological concepts including whether the universe is truly infinite, how it can expand if it's already infinite, and the possibility of a closed universe that curves back on itself like a sphere. Learn about the fascinating connection between spatial expansion and Hilbert's Hotel paradox, while examining the intriguing possibility of cosmic copies of ourselves existing in distant regions of space. Through clear scientific explanations, gain a deeper understanding of current cosmological knowledge and the remaining mysteries about the universe's true size and structure.