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A microquasar is like a small quasar: a smaller black hole (e.g., a stellar-mass black hole) accreting matter from a companion star via an accretion disk with jets, all analogous to those of a quasar, but not necessarily scaled down proportionally. A number are known, the first being SS 433, an astronomical object whose existence was published in 1977, and by 1980, there was speculation that it could include a black hole.