Binary star system SS433. Computer illustration of the unusual binary star system SS433. This is a binary star system in which one component (top left) is a blue giant star, and the other (centre) is an extremely dense neutron star. The neutron star is pulling material from the blue star, which forms an accretion disc around it. Hot gases in the accretion disc emit X-rays before they fall onto the neutron star. The jets seen perpendicular to the disc travel at over a quarter of the speed of light away from the disc. The precession of the accretion disc (wobbling motion) causes the jets to swing around in a precise, regular period of 164 days.