Composite X-ray image of SN1572, Tycho's Nova, remnant (NASA)
This was also one of the last supernovae to be observed in our own galaxy, the last being just 32 years later, in 1604. Supernova are thought to occur at least every 100 years or so in galaxies like our own, and so we are long overdue to observe one in our night sky. Although, considering our galaxy is 100,000 lightyears across, it's probable that the event has already occurred. And I thought I had to wait a long time to watch the latest episodes of Doctor Who here in New Zealand.