No worries. A real supernova has to be within 160 light-years to unleash its damage on Earth.
Since it takes 160 light years to see one implode then explode, you will never see one in your lifetime.
One thing few understand is how long it takes for light to travel. Every single star you see in the night sky, may have already burned out. Many have; however, their light keeps traveling after they go supernova for many years after.
When a change takes place on a star 400 light years away, it will take 400 light-years for you to see the change.
Astrophysicists are seeing the past when looking in the night sky. Nothing you see is a present picture of a star. It is always old information...
This is why I disagree with them. They cannot predict what stars are doing, only what stars have done in the PAST. We may live an entire lifetime without knowing what is heading our way.
There is absolutely nothing that can be done when a gamma-ray burst decides to hurl itself in our direction. It is deemed the most powerful explosion in the entire universe.
If one hit Earth, it would cook every living thing on the planet as in a micro-wave, oceans as well. Nothing survives. Not even the atmosphere.
Welcome to your universe.