Our entire existence may be a sort of stable spacetime bubble that can pop at any moment.
Like ants nesting on a river bank, some only live a few days. A colony could live for many ant generations on a riverbank but when a big flood comes their entire world is wiped out.
Looks like closest white dwarf is 8.6 light years away. How would that work, would the light from the supernova get here before the radiation/matter/whatever wipes us out? With the star exploding in more or less a 360-degree sphere how much would even hit our solar system?