what is grandfather paradox?

Answer 1

I think it's the idea that if it were possible to travel back in time. you could go back and shoot your grandfather, meaning that your father and you were never born. But if you were never born, then you didn't go back in time, so you didn't shoot your grandfather, so you were born, so you did shoot your grandfather, so...It never ends. That's why it's a paradox.

I think this is an example of a more general type of paradox, which is that if event A influences event B, it's logically impossible for event B to also influence event A. Causality only proceeds in one direction. Another example of this paradox is:

A famous, and proven, psychic asks you to take part in his show. He shows you two closed suitcases. The one on the left is guaranteed to have $1000 in it. the one on the right could have $1000000--or nothing. The psychic tells you you can take either or both, but that he's already looked into the future to this moment, and if you take them both, the $1000000 suitcase will be empty. It will only contain money if you don't take the $1000 suitcase. What should you do? On the one hand, the psychic has been proven (in this fantasy world) to see the future, so his prediction should be accurate. On the other, the suitcase have already been packed, so picking up the $1000 suitcase won't cause the money in the other one to disappear.

It's kind of the same thing--when the line between future and past starts to blur, paradoxes crop up.

Answer 2

when you return to the beyond earlier than you have been born, and your grandfather died in any way earlier than you have been born then the query of the likelihood of time journey to the beyond isn't viable considering the fact that if the grandfather or grandmother paradox occurred then why you're there? But there may be one other speculation related to the life of a parallel multiverses that defy the grandfather paradox. it tells that there are lots of earths at specific house time size and you're no longer the one you. There are many you at specific house time size. When you return in time you'll be able to be competent to satisfy the opposite you and the opposite grandfather of the opposite you. But once more that is simply an imaginary speculation and can not be verified and often be unattainable to end up or disprove. But technology is definite that point journey most effective results in the longer term and that is how mild 12 months is being measured by way of physicist. If you're watching on the big name correct now, you're seeing the beyond however when you begin traveling going to that big name the time will begin counting going to the longer term. whenever you achieve that big name you're not watching at what you've got determined from in which you got here from. That's how treaky mild is.

Answer 3

The grandfather paradox refers to time travel.

In the event that it were possible to travel backwards in time (current physics indicates that forward travel may be possible, but backwards travel is prohibited), if you were able to kill your grandfather, you would not be born. This creates a paradox, since if you were not born, you could not travel backwards in time to begin with, and time travel, were it possible, would not allow paradoxical situations.

There is not telling what the impact of an untimely death would have on the future, so ANY event that would affect a future outcome that had already occurred would be prevented because of its paradoxical nature.

Answer 4

it's the paradox that occurs if you were to have a time machine, and then to go back in time and accidentally kill your grandfather before he met your grandmother. so then one of your parents would never have been born, so you couldn't have been born either, but if that is the case then your grandfather would have met your grandmother and you would have been born and killed him ....

Answer 5

I think it is where in discussion of time travel you consider what would happen if you went back in time and impregnated your own grandmother -- in other words you are your own grandfather. This is really just an easy to understand example of why time travel would screw up cause and effect -- if you are the effect of the past, then if you went back to the past you'd also become a cause of yourself.

Answer 6

An argument against time travel.

Suppose one were to travel back in time and one killed ones grandfather.

This would erase ones own existence making it impossible for one to have traveled back in time to begin with.

Answer 7

You have 2 parents
Each of your parents have 2 parents. (That makes 4)
Each of your grandparents had 2 parents (that makes it 8)
and so on .......

So you can see that the population of the world was much much more than what it is now ! The human race is getting extinct.

Answer 8

if your grandfather did not have any kids, he cant be your grandfather

Answer 9

Something about time travel......