Disk Around Young Star. A View of HK Tauri

HK Tauri is the first example of a young binary star system with an edge-on disk around one member of the pair. The thin, dark disk is illuminated by the light of its hidden central star. The absence of jets indicates that the star is not actively accreting material from this disk. The disk diameter is 20 billion miles (about 32 billion kilometres). The brighter primary star appears at top of the image.