Rocket astronomy has mapped the spectrum of the sun from the ground level cutoff at 3000 A down to x-ray wavelengths as short as 0.1 A. The x-ray emissions are strongly dependent onsolar activity with greatly enhanced intensities accompanying solar flares. Photographs from rockets have revealed the disk distribution of ultraviolet emission. The first measurements ofultraviolet light of the night sky have discovered the existence of extended ultraviolet nebulosities surrounding hot stars and a bright diffuse glow of Lyman-α radiation scattered fromneutral hydrogen in space.