Given the task definition and input, reply with output. In this task, you are given a paragraph, event and an entity. The event is part of the given paragraph and it changes the state of the entity. Your task is to classify the state of the entity into three classes: 1) not exist, 2) unknown location and 3) known location. "not exist" means the entity doesn't exist in that state anymore. "unknown location" means the entity exists in that state but location is unknown. "known location" means the entity exists and location is known. 

 "process paragraph : : Comets fly around in outer space. A comet flies close to a planet. The comet enters the planet's atmosphere. The comet crashes into the planet. The energy of the impact creates a hole on the planet. ", "event : A comet flies close to a planet.", "entity : comet" 

 known location 