Title: Evolving and revolving: the relativistic jets of SS433 Katherine Blundell Oxford University Abstract: SS433 is the prototypical example of a microquasar: an object in our Galaxy that ejects plasma jets at speeds comparable to the speed of light. I will highlight some new results on SS433, including the determination of its distance to within 0.2 kpc using special relativity, the beautiful detailed symmetry of changes in its jet behaviour and the exquisite precision with which we can observe the time-evolution of its jet activity.