How does this relate to astronomy? Every 100 years or so, a star in our galaxy explodes, but no such explosion has been seen in over three hundred years! Astronomers are expecting that a "supernova" could occur at any time, and so have built up an armada of equipment that can start exploring the supernova as soon as it happens. It could be decades or centuries until we see a supernova in the Milky Way, but it could happen tomorrow. Like earthquakes, it is not possible to predict a supernova. And, like today's Parkfield earthquake, when a supernova does go off, we'll be ready and our time and money will pay off.