Paradoxes

__Paradoxes__

Definition: A paradox is an endless loop of something that contradicts itself This sentence is false: This sentence is widely noticed as a paradox from the video game Portal 2. This is a paradox because if the sentence is false then the sentence would be true but if it was true then it would be false and so on. Paradoxes using physical items: The only way to get a paradox using physical items is to use time travel. It is pretty much when you go back in time and change something so much that something in the future doesn't happen at all. An example of a paradox is if you went back in time and you killed your grandfather before your father was born. This would make it so your father wasn't born so yo were never born, literally. If you are the outcome of a paradox you literally get erased from existence so no one will ever remember that you ever existed.
 * Paradoxes **

People have many different views on time travel, and also the things that go wrong in it. Paradoxes is one of those things. In a Doctor Who episode, called Father's Day, the Doctor's friends, Rose, saves her father from being hit and killed by a car, by doing this it unleashes monsters from reality that try to return time to what it was by killing her father. Other effects of paradoxes in Doctor Who, is shown in the episode, The Girl Who Waited. In this the Doctor and his companion, Rory, accidentally try to save another companion, Amy, but they accidentally go far into the future and find her thirty six years later. After doing this, they try and go back in time with the old Amy, to save the younger version of Amy. By doing this, it has created a paradox, and they need to leave the old Amy because it was a paradox. Because they left her and saved the younger Amy, the old Amy was never stuck in the future, so it is a paradox. When they leave her, she gets erased from time because that time line never existed. In Back to the Future, it has similar consequences to making paradoxes as Doctor Who. If the main character, Marty, doesn't make it so his parents get together, then he wouldn't have been born. If he didn't do this, then he would be erased from time and no one would have know who Marty McFly ever was. By creating paradoxes, they destroy the future you came from, and create another from it.
 * Paradoxes in Fiction **

The Temporal Paradox is a paradox which is created only with time travel, when the time traveler goes back in time and changes something in the past that contradicts why the time traveler has gone back in time. The best example of this is the Grandfather Paradox. Another example of this is the movie Back to the Future, in which Marty McFly goes back in time and interferes with his parents meeting which would make it so he wasn't ever born. He then fixes the paradox and goes on existing.
 * Temporal Paradox **

If we go back in time and change it so the future doesn't happen, then we know that paradoxes would happen. The best example of this happening is the grandfather paradox. The Grandfather Paradox is when you go back in time to kill your grandfather (hence the grandfather paradox) before he met your grandmother. By killing him, you made it so your father or mother wasn't born so you couldn't have been born, which would make it so you would never have gone back in time to kill your grandfather and you would never have existed.
 * The Grandfather Paradox **

The Predestination Paradox (also called the casual loop) happens when the time traveler is caught in a chain of events that led them to where they are now. One of the biggest examples of this is in Harry Potter and the Prisoner of Azkaban. When harry is saved from the Dementors by a stag patronus that was cast by his futu media type="youtube" key="4Li0Y5hVa_8" height="315" width="560" align="right"re self. Harry and Hermione then go back in time using Hermione's Time Turner to save Buckbeak the hippogryiff, and Harry's god father, Sirius Black. Harry then saves his past self by casting the stag patronus which he had seen in the past, saving himself and, in a way, pushing himself to do the events that he had just done.
 * Predestination Paradox **

The Ontological Paradox, or Bootstrap Paradox is a paradox in which information or objects can be created without ever being created. The object or information is sent back in time and then recovered in the future by the past version of the person who sent it back. The term Bootstrap Paradox came from the saying "pulling yourself up by your bootstraps," which fits really well with the name, because the person sends back the object or information to help themselves to do the same thing. An example of this is in the Doctor Who episode "Blink." In this, the Doctor gets stuck back in 1969 and records a series of videos from a manuscript that he had gotten earlier. In future 2008, a woman named Sally Sparrow finds the videos and some one who has recorded all that the Doctor says in the videos. When watching the videos, Sally Sparrow has a conversation with the videos that follow the manuscript that Sally's friend has written. He then writes all that Sally says which corresponds perfectly with the Doctor's videos. Sally then meets the past Doctor in 2008 before he got stuck in 1969 and gives him the written manuscript so he can create the videos to help Sally.
 * Ontological Paradox **

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