What is a vacuum?

Maddie and Dr Sheila Kanani accidentally get sucked into a vacuum cleaner - and use the opportunity to understand a vacuum, and why space isn’t quite as quiet as you might think. Maddie's Sound Explorers is brought to you by Magic Star. This episode uses the following audio from YouTube modified under a CC-BY 3.0 licence:  Parker: Sounds of the Solar Wind by APOD videos, with credit to JHU APL and Avi Solomon.