Final answer:
In the book Wonder, Auggie's astronaut helmet is smashed by Julian in the woods during a school trip.
Step-by-step explanation:
In the book Wonder by R.J. Palacio, it is mentioned that Auggie's astronaut helmet was smashed by Julian when they were in the woods.
This incident happens during the school trip, and Auggie is deeply upset by the loss of his special helmet.
It was a significant event in the story as it added to the conflicts between Auggie and Julian.