Preventing the Grandfather Paradox
Do not, I repeat, DO NOT, travel back in time and kill your own grandfather. You will be erased from existence.
- TIMELINE PRE-CONDITION: (T) = Time Traveler; (G) = Grandfather; (T' ) = Future Grandson
Example:
- If you travel back and kill (G), you will be erased, and (T' ) will never be born. Read more on The Grandfather Paradox
The Bootstrap Paradox
Be careful when sending messages to your past self. You might cause a bootstrap loop.
Learn more about bootstrap loops
The Novikov Self-Consistency Principle
Traveling back in time can be messy. Make sure to tidy up before you leave.