What kind of apocalyptic event can be predicted years before it happens?

I'm looking for a realistic apocalyptic event, which can't be prevented, but can be accidentally predicted long before it actually happens. By the prediction I mean a scientific prediction, of course. And by accidentally, I mean that only selected few would learn about it purely by chance.

I guess, an asteroid on collision course with Earth could be an example. But can we really predict such an event a dozen years before it happens? I think, the best thing we can do is guessing that an asteroid would pass within a few million miles away from Earth. Furthermore it would be difficult to pull off the accidental part.

posted over 7 years ago

Sanko‭

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