When a huge fireball hurtles towards the Earth the authorities have only hours to react before temperatures soar beyond human tolerance. When a huge fireball hurtles towards the Earth the authorities have only hours to react before temperatures soar beyond human tolerance. When a huge fireball hurtles towards the Earth the authorities have only hours to react before temperatures soar beyond human tolerance. When a huge fireball hurtles towards the Earth the authorities have only hours to react before temperatures soar beyond human tolerance.