Final answer:
The astronaut helmet Auggie wore that led to his nickname 'Major Tom' was given to him by family friend Miranda in the book 'Wonder' by R.J. Palacio.
Step-by-step explanation:
The astronaut helmet that Auggie wore as a young boy and led to his nickname Major Tom was given to him by Miranda, a family friend. This detail is from the book Wonder by R.J. Palacio, which is a story of a boy with facial differences who starts attending a mainstream school and faces various challenges and triumphs. The helmet became a significant element in Auggie's childhood as it allowed him to hide his face from others, giving him a sense of comfort and anonymity.