Expanding Universe Balloons While we don't know everything about the Universe, we do know that it's expanding. See what an expanding universe looks like and learn how you can make your own! Facebook Video https://www.facebook.com/RocketCenterUSA/videos/3251067828259637/?t=0 YouTube Video https://youtu.be/hWefRsdIhJM Content Area Physical Sciences Type Do an experiment Grade Level(s) 3 4 5 Transfer Status Transferred