This animation shows the unique triple-star system with a superdense neutron star and two white dwarf stars. The neutron star is a pulsar, emitting lighthouse-like beams of radiation as it spins on its axis. These beams, in blue, are seen sweeping through space as the neutron star rotates. At the start, you see this pulsar and its close companion white dwarf in orbit around their common center of mass. The animation zooms outward, showing this pair also in orbit with a more-distant, cooler white dwarf, and illustrates the motions of these three bodies. The entire system would fit within Earth's orbit around the Sun.