Why do stars twinkle?

When you look up into the night sky, do you see the stars twinkle back at you? Three-year-old Max really wants to know why the stars twinkle, so our Imagine This host Bri has teamed up with astrophysicist Jonti Horner, from the University of Southern Queensland, and a bunch of inquisitive kids to investigate the night sky and find out what makes the twinkle happen.