In the Space Frontier booth, you will come to the Cosmic Slash n' Defense mini game.
This mini games has a small similarity to Fruit Ninja (which I hope everyone is familiar with).
Basically wait till you see a giant green asteroid fly into the sky. Quickly slash it. The camera will zoom into the giant green asteroid, at this point you have to be quick with your slashes. You have just enough times to get 12 slashes before the time is up.