All the things you gave for examples are human constructions so, to me, they existed and ceased to exist because a human or a group of humans acted and, through their decisions, changed history.
Now, if you're asking the reason why the something like the Shoemaker Levi comet's existence ended when it hit Jupiter, then I can't have an answer for you because I don't know the force behind non-human events.
The Virtue of Existence
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Human will + right place + right time
All the things you gave for examples are human constructions so, to me, they existed and ceased to exist because a human or a group of humans acted and, through their decisions, changed history.
Now, if you're asking the reason why the something like the Shoemaker Levi comet's existence ended when it hit Jupiter, then I can't have an answer for you because I don't know the force behind non-human events.