Grandfather Paradox: Explained in Simple Words

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The grandfather paradox is considered the biggest, most popular objection to the logical possibility of backwards time travel. It characterizes a hypothetical situation in which a time traveller goes to their past and ends up causing an event (like, the killing of their grandfather) which makes travelling to the past and altering it impossible.
What this means is that if you go back in time and kill your grandfather, you don’t exist, which means that your grandfather cannot be killed. As you can see, there are two realities occurring in parallel here. The grandfather paradox is also a key plot element in the famous Hollywood movie Tenet (released in 2020), directed by Christopher Nolan.
Although all this talk about time travel and the grandfather paradox is obviously purely hypothetical, there is evidence of two realities occurring in parallel at the same time. This is a phenomenon in the quantum world which is known as superposition.

Table of Content:

Intro: 0:00
The Problem of travelling to the past: 0:49
What's the Grandfather paradox: 1:10
What is superposition: 3:16
Is travelling to the past possible?: 3:45

#science #animation #grandfatherparadox

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I loved both my grand -fathers so problem solved.

ms.miwitdatbul
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Hypothetically when I travel in time it would create a divergent timeline, rather than my own past, technically I am not shooting my grandfather but a mirror universe version of my grandfather, hence creating the mirror version of my past self to never be born , but my reality would still exists. This also justifies that time can always move in a single direction

blspot
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Grade 9 I came to the same conclusion. I didn’t know the paradox was already named

It’s getting harder every day to invent or come up with something new to name myself

behcherry
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Thanks dude gonna go visit my grandfather!

little_cheezers
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How To Travel Back In Time
1. Build circulating light beams machine.
2. Use circulating light beams machine to travel back in time to travel to year 1985 AD.

davewilliam
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The solution to time travel paradoxes could be seen through the many worlds idea. If you travel back in time you now exist in a different world and your future from that point on is yet to unfold. The time/place you travelled from still exists but is a different world, it just shares the same history up to the point you travelled back to.
If you go back and kill your grandfather two worlds now exist. The one with you and your grandfather (alive or dead but not murdered) and the world where you exist having just killed your grandfather.
Where this idea gets a bit difficult is if you go back in time and watch your mother give birth to yourself you are now in a world with two humans sharing the same dna and exact features. A bit like identical twins but with massive age differences.

paulm
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Tenet probably had the most gruesome explanation of it.

agentsbf
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I'm watching The Umbrella Academy Season 3 and had to look this up 🤔

chloeblankenship
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going back in time is like running on a beach with the tide coming in washing away your footprints.you can can back to where you roughly left. But your footprints have gone FOREVER.So everything you know will not exist, and you will not even recognise the same earth.you would have back to another multiworld earth.

michaelrouse
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Me: kills grandfather
.

.

Also me: wait shit I forgot to time travel

infinityinfinity
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Grandfather paradox is only an easier to understand example. There would be paradox as long as history has been changed. History is not limited to major events which we care about, but also trivial microscopic events like the specific location of a specific atom at a specific time. If in the original timeline there was no future-you that suddenly showed up at your grandfather's time, the moment you travelled back in time, there is already a paradox.

StephenWong
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except her own personal timeline still exists.
she can kill him in whatever past she likes-
but she still has a past that continues to exist.
no paradox.

ericvulgate
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How To Travel Back In Time
1. Use the digital clock to make the digital clock one hour backward.
2. Use the digital clock to make the digital clock two hours backward.
3. Use the digital clock to make the digital clock go three hours backwards.

davewilliam
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If you choose not to kill your grandfather when you travel back in time, will the paradox still exist? Does it imply as long as you do not choose to kill your grandfather, backward time travel is possible?

jackyleecs
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If you had a time machine and went back 120 years in the past (before any currently living human being was born) and stepped on a blade of grass, when you returned to the present every single human being alive today would be a completely different person.

jaypee
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This helped me understand a little bit more about tenet. Thanks

alphadawg
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How To Travel Back In Time
1. Use digital clock to make digital clock five hours backwards.

davewilliam
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What if you transform into the age you were when you time travel?
If that's so, then you wouldn't be able to invent it, since you invented it, and it didn't exist at that time

eiko
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I knew that the Terminator franchise got it wrong. I mean Skynet can send as many Terminators into the past to kill Sara Conner but, it still won't change it's imminent defeat by the human resistance.

MackeyDeez
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What a concept of Superposition, it will be awesome to know the parallel coexist of our world it is fabulous

AtharviChevale-evtx