7D20.10 • Expansion of the Universe

Photo of the Demonstration at the University of Texas at Austin.

Concepts Conveyed:

• As the Universe expands, all points get further and further away from each other.
• The further two points are away from each other, the faster they move away from each other.

Instruction/ Notes

• Make sure that the black marks on the balloon are visible. (reliable if needed).
• Take out the the Balloon pump so the professor can expand the weather balloon.
• When done, release the balloon air and put it on the designated shelf.

Staff notes:

• Need to make sure to test the Balloon Pumper before you take it to the professor.
• Video of the experiment: https://www.youtube.com/watch?v=hDTPvIKw9z8

Last updated on September 30, 2025