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The conditions necessary for an astronomical apocalypse are the shifting of earth from its orbit and collision of big star with earth.

Conditions necessary for happening of an astronomical apocalypse

The apocalypse event occurs due to climatic, nuclear war, plague or virus, zombie apocalypse or alien invasion but astronomical apocalypse occurs due to the shifting of earth from its orbit and collision of big star with earth.

So we can conclude that the conditions necessary for an astronomical apocalypse are the shifting of earth from its orbit and collision of big star with earth.

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