There is a concern in many countries with participation rates in science. One response to this has been a proliferation of university run science outreach programs that aim to both engage and retain students in science. Previous studies of outreach programs have tended to take into account the perspectives of just a few stakeholders in the program. Although this approach has led to some understanding of outreach programs it underplays the level of complexity in running outreach programs and leaves a gap in understanding how student identity and aspirations toward science are supported in science outreach. This research has investigated the perspectives of students, teachers, parents and scientists in one university run astronomy outreach program with the aim of better understanding the role that communities of practice play in science outreach in developing students' science identity. The study confirms the importance of sustained support rather than single interventions and highlights how the development of community within science outreach contributes to shared affective experiences of astronomical phenomena and practices.