The first one I'm going to discuss is referred to as "Whatever happened, happened", or WHH for short. What this theory says is that no matter what you do you can't change the past. Everything that you are doing you have always done. Let me clarify by using the example used in the movie "Twelve Monkeys".
A man is sent to the past to collect spiders but is accidentally sent too far into the past. He has a couple of more time travel journey and is soon convinced he has imagined the whole thing. He is met by his friend and is told he has to assassinate somebody transporting a highly dangerous virus, which caused the few remaining humans to live underground. While rushing at the man with the gun the police shoot him down, cause the events he witnessed in his past.
Another theory is that you can change the past. The popular "Back to the future" trilogy took this approach. The problem that I have with this theory when used in science fiction is that they always give you an alloted time period to fix things, which in the real world would have an instant effect. This theory is referred to as "The butterfly effect".
The next theory that I will be discussing is the multiply timelines theory. What this says is that you can go to the past and cause a different set of events to occur, but that isn't changing your universe. Instead it is creating a parallel universe. So the popular "grandfather paradox" is irrelevant since you won't be preventing your birth, just the birth of an alternate version of your self.
The final theory that I will be touching on is "Course correction". This theory says that even is you change one thing the universe will have it so that you're change has minimum effect. For example if you kill Bill Gates another man will open a successful computer and software company.
That's all I have for today. Come back tomorrow for the next post, and be sure to tune into my podcast on October 2 at 7:30pm. Link to the podcast page is below. Thank you for reading.
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