Scientists eager to avoid the paradoxes presented by time travel have come up with a number of ingenious ways in which to present a more consistent version of reality, some of which have been touched upon here, including:
The Solution: time travel is impossible because of the very paradox it creates.
Self-healing hypothesis: successfully altering events in the past will set off another set of events which will cause the present to remain the same.
The Multiverse hypothesis: an alternate parallel universe or timeline is created each time an event is altered in the past.
Erased timeline hypothesis: a person travelling to the past would exist in the new timeline, but have their own timeline erased.
** The deeper you dive to understand Time travel, the more you will be MIND BLOWN. **