If you could travel back in time and change something, would the present still exist?
This is the grandfather paradox. If you change the past, does the present collapse? Or does it create an alternate timeline?
Answer (1)
The grandfather paradox is a famous thought experiment in time travel. It asks: If you go back in time and change something important (like preventing your grandfather from meeting your grandmother), would you still be born?Two main ideas about what could happen:1. The present collapses (Paradox):If you change the past, the present may no longer happen as it did. This causes a paradox because if you were never born, you couldn’t have gone back to change the past in the first place.2. Alternate timeline is created (Multiverse theory):Changing the past creates a new timeline or reality. Your original present still exists in another timeline, but you're now in a new version of history with different outcomes.It depends on the theory. Some scientists and stories say the present would collapse (paradox), while others believe it would create a new or alternate timeline.
