Have you seen that scene from Star Wars where Yoda uses the force to lift the spaceship out of a swamp? Its energy is so powerful, but what exactly is it made of? 

That's what Ela, aged 10 from Melbourne, wanted to know. And so she joined our host Eloise to ask Sam Baron, a science philosopher at The University of Melbourne to find the answer! 

The Conversation's Curious Kids is published in partnership with FunKids, the UK's children's radio station. It's hosted and produced by Eloise, and this episode was executive produced by Stephen Harris. Full sound credits available here. 

If you have a question for an expert, email us at curiouskids@theconversation.com or record it and send your question to us directly at https://funkidslive.com/curious. 

And explore more articles from our Curious Kids series on The Conversation including a print version of the story in this episode. 

**Disclosure statement:**

_Sam Baron receives funding from the Australian Research Council. _