This article talks about fulldome video, a new technology which has been adopted fairly extensively by the larger, well-funded planetariums. Fulldome video, also called immersive projection, can help teach subjects ranging from geology to history to chemistry. The rapidly advancing progress of projection technology has provided high-resolution projectors at increasingly lower prices, resulting in entry-level systems within the reach of schools. The breakthrough for schools about fulldome systems has been twofold: higher-powered projectors combined with a special lens that allows coverage of the dome with a single projector. Another optical approach, developed in Australia, uses a spherical mirror and a projector with a non-fisheye lens, resulting in even lower prices, although with lower projection quality. Here, the author discusses how students learn through the immersive environment of fulldome video and describes some issues to be addressed in the future evolution of this new technology. (Contains 18 online resources.)