The Youth Astronomy Apprenticeship (YAA) is a yearlong, out-of-school time initiative that connects urban teenage youth with astronomy as an effective way to promote scientific literacy and overall positive youth development. The program employs the strategies of a traditional apprenticeship model, common in crafts and trades guilds as well as in higher education. During the apprenticeship, youth develop knowledge and skills to create informal science education projects: through these projects they demonstrate their understanding of astronomy and use their communication skills to connect to