Several parameters of the radio-bright supernova remnant Cas A, located approximately 3.4 kpc from Earth, are calculated in this worksheet. The supernova was observed in 1667, and its remnant has expanded to a diameter of 4 arcminutes. Relativistic electrons and protons are contained in the remnant, and the relativistic electrons are a source of synchrotron radiation.

For more information on how to do this problem, and for tables of relevant data, see www.canismajor.ca.