3 Time Travel Paradoxes!!

Vsauce, I’m Jake and what are you doing
on the ground? Let’s get you standing up…there…you’re looking great. Actually since I have you here,
have you seen the film Interstellar? I watched it recently and in the movie they use a wormhole,
a shortcut through space and time to travel much more quickly…ostensibly time traveling.
And that got me thinking about a complicated part of time travel, paradoxes. Like the bootstrap
paradox, also known as the Ontological Paradox, which has been used in things like the Ocarina
of Time, Time Splitters, Terminator, and Back to the Future. It’s when information or
objects are never really created, because their existence starts by coming from the
future and ends by going to the past to become themselves… for example in the Ocarina of
Time Guru-Guru teaches Link the Song of Storms in the future, yet Guru-Guru learned the song
from Link when he traveled back in time or…wait…where did this camera come from again?… Excuse
me, I’m trying to film could you keep it down a bit? Actually, let’s travel a little
into the past and talk about the Predestination Paradox. The predestination paradox is when you travel
to the past to stop or change the outcome of an event (phone rings) “Hello?”
Jake “Bill?”
Jake, Jake you’re travelling through time. “I am, correct.” So what you’re going to experience is Time
Dilation. What you and I think of as the speed of time as being constant even when we’re
in a hurry even when we lose track of time. We nominally imagine a clock that’s running
at a constant rate relative to the universe but that turns out not to be true. Its not
the speed of time is constant its the speed at which energy can move is constant this
is to say the speed of light. So, I want you to be careful of this because when you look
at your watch it will look like time is passing at normal speed, normal rate, but in fact
the universe is moving along at its own speed and when you try to reconnect with it you
might end up changing the course of history in such a way that you never exist…and neither
do I. “Bill? Bill? Bill? Bill?!!” Excuse me, I’m trying to film could you
keep it down a bit? So with the predestination paradox, you travelling
back in time to stop an event is what caused it in the first place. And the creation of
that instant leads to future you going back in time to try and fix it…lets move on. When we think about traveling backwards through
time, we tend to think of it like the Butterfly Effect where an action as seemingly inconsequential
as stepping on a flower or killing a bug can cause a domino effect, rippling through space
and time to drastically change the future. Do I have a mustache now? And a knife? However,
in most paradoxes the timeline is an endless loop. Isaac Brock has a great verse, “The
universe is shaped exactly like the Earth, if you go straight long enough you’ll end
up where you were.” And why am I still holding this knife? Oh….oh no…oh I am so sorry…I killed
myself, literally…wait no this is perfect…we just hit the Grandfather Paradox. The Grandfather
Paradox is fairly simple. If you were to go back in time and kill your grandfather, he
wouldn’t be able to have one of your parents and they wouldn’t have been able to have
you which means you wouldn’t exist and therefore wouldn’t be able to go back in time and
kill your grandfather…in this case (points to body out of frame) I killed myself, but
if I killed myself before I could go back in time to kill myself I wouldn’t be alive
to go back in time to kill myself which means I never killed myself so then I’d be alive
to go do everything again leading up to me going back in time and accidentally killing
myself…making this whole video…a paradox…and as always, thanks for watch… Vsauce, I’m Jake and what are you doing
on the ground?

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