Figure 4-17 RIVUXG Jets and Winds from Young Stars (a) This protostar in the constellation Taurus (the Bull) is ejecting matter in two immense jets directed perpendicular to the plane of the accretion disk. Red denotes light emitted by hot ionized gas in the jet, while green denotes starlight scattered by dust particles in the disk. (b) In this Hubble Space Telescope image an outpouring of particles and radiation from the surfaces of the young star LL Ori can be seen carving out a cavity in the surrounding, slower-moving, dusty material, forming a crescent-shaped bow shock.