What is the universe expanding into? - Sajan Saini

Join TED-Ed’s Student Program: View full lesson: The universe began in a Big Bang nearly fourteen billion years ago, and has been expanding ever since. But how does the universe expand and what is it expanding into? Sajan Saini explains the existing theories around the Big Bang and what, if anything, lies beyond our universe. Lesson by Sajan Saini, directed by Wooden Plane Productions. Thank you so much to