What would your voice sound like on another planet?

Oxygen appeared on earth over 2 billion years ago, and life took off. Now it makes up just over a fifth of the air. If oxygen levels radically changed, our voices could sound very different. We all know what a lungful of helium can do. Acoustician Tim Leighton has been looking at the acoustics on other planets, where the atmosphere has a very different composition to the one on Earth. Trevor Cox finds out what our voices would sound like on Mars and beyond.

First broadcast on In Their Element, 2 May 2017.