Listen to the sound clip On Pluto, I'd be light as a bird, and a bird would be light as a feather. That's because Pluto is so small and light, it doesn't have much gravity. from Arnold - Magic School Bus Explores the Solar System - Character Voices (PC - Computer):

On Pluto, I'd be light as a bird, and a bird would be light as a feather. That's because Pluto is so small and light, it doesn't have much gravity.

This sound is from Arnold - Magic School Bus Explores the Solar System - Character Voices (PC - Computer)

Character Voice sounds from the PC / Computer game Magic School Bus Explores the Solar System.