If the Milky Way experiences four dozen supernovae per year, how many centuries would that equate to?

4,800 events per century

This calculation is derived from the highest end of the supernova rate estimates provided. If one posits that the Milky Way experiences forty-eight supernovae within a single year, calculating the rate per century requires multiplying that annual figure by one hundred. Therefore, 48 events/year multiplied by 100 years results in an estimated total of 4,800 supernova events occurring per century under this upper-range scenario. This projection dramatically contrasts with the lower estimates, which suggest only two events per century, highlighting the extreme divergence in astronomical calculations due to observational difficulties.