Between the blue sky above us and the infinite blackness of space lies a frontier full of enigmas that scientists have only just begun to investigate.

At the Edge of Space takes viewers on a spectacular exploration to probe the earth-space boundary zone, which is home to some of natures most puzzling and alluring phenomena: the shimmering aurora, streaking meteors, and fleeting flashes that shoot upwards from thunderclouds known as sprites. NOVA rides with scientists in a high-flying weather observation plane as they hunt for sprites and finally succeed in snaring them in 3D video, gaining vital clues to unravel their mystery. NOVA also combines advanced video technology with stunning sequences shot from the International Space Station.