No you can still time travel, but yes you cannot change things. It has to be self consistent. For example, if you plan to go back and kill your grandfather, yo

No you can still time travel, but yes you cannot change things. It has to be self consistent. For example, if you plan to go back and kill your grandfather, you'd perhaps be run over by a car two blocks before you get to him, but if you had read past newspapers carefully before your trip, you would have noticed a short article at the end of the newspaper about some mysterious John Doe who wore funny clothes and got run over by a car just on the day you planned to kill your grandfather, which ended up being you, the time traveler. Sean Carroll discussed different time travel logics using popular Hollywood movies on his podcast once. Here is essentially the same thing in writing: https://arstechnica.com/features/2023/11/the-ars-guide-to-time-travel-in-the-movies/ https://arstechnica.com/features/2023/11/the-ars-guide-to-ti...