The school itself is a place to learn knowledge, not a place to worship. The teacher's duty is to spread the word to dispel doubts, but in order to satisfy personal selfishness, it is a bit unreasonable to bring private goods in class and take students to help stars.
As a teacher, liking a star is a personal matter, but it is beyond your authority to kidnap students with your own ideas and instill idolized ideas in the classroom.