Abstract
It is argued that SS 433 is a massive binary consisting of a B-star and a young neutron star plus accretion disk, at a distance of (3 ± 0.5) kpc. W 50 is the 4 × 10 4 ± 0.3yr old supernova remnant that was ejected at the neutron star's birth. The radio ansae of W 50 have been blown out by a pair of extremely relativistic jets driven by the fast-spinning neutron star, and confined by the wind of the B-star. The system is rare because the accretion disk was already assembled some 10 4 yr after the neutron star's birth, probably because of almost equal component masses of the progenitor system.
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