[img]http://puu.sh/yd4CE/4f3e687adc.jpg[/img]
that's a lot of tabs michael
[QUOTE=Hakita;52847555][img]http://puu.sh/yd4CE/4f3e687adc.jpg[/img]
that's a lot of tabs michael[/QUOTE]
50% of those are spit facts
"An Airor"
goddamnit michael
So gravity is just... spacetime in action?! I'm scared
I thought Down is a direction relative to the individual's perception of up, which is a direction we currently classify as the direction opposite of Gravity's pull.
In a case without Gravity though, our idea of Up or down would be in relation to our body's orientation. Head is up, Feet are down.
[QUOTE=Daemon White;52849289]I thought Down is a direction relative to the individual's perception of up, which is a direction we currently classify as the direction opposite of Gravity's pull.
In a case without Gravity though, our idea of Up or down would be in relation to our body's orientation. Head is up, Feet are down.[/QUOTE]
Up and down would be an inapplicable concept without gravity, it wouldn't make any sense. It would be the same as trying to apply up and down to a 2D creature in a 2D universe, it simply doesn't exist.
[QUOTE=Foogooman;52849268]So gravity is just... spacetime in action?! I'm scared[/QUOTE]
Gravity is just the curvature of spacetime existing, as far as I can tell. Using these layman symbolic expressions don't really do the concept justice though and don't come close to the picture the actual math paints, as far as I can tell aswell.
[quote]Why do things fall? Are they being pushed or pulled? Or is it because of time travel?[/quote]
Man, I thought the time travel question was a non-sequitur but I'm pleasantly surprised by how well that foreshadowed the rest of the video.
[QUOTE=MrJazzy;52849317]Gravity is just the curvature of spacetime existing, as far as I can tell. Using these layman symbolic expressions don't really do the concept justice though and don't come close to the picture the actual math paints, as far as I can tell aswell.[/QUOTE]
Nah most of it is a pretty good analogy. Geodesics are the "straightest possible" lines in curved space, and they're the paths that objects fall on under gravity in the absence of other forces.
I really liked the "ribbon test." I thought that was a quite clever way to show the geodesics of surfaces without just saying "it's these curves."
[QUOTE=Xyrec;52847712]50% of those are spit facts[/QUOTE]
the rest is spit porn
So what we call gravity is really just the simplest path an object takes to move forward in time?
Ok, but what [i]is[/i] spacetime?
Checkmate Newton and believers, gravity is fake.
so if matter is attracted to slower relative time why don't we just put slower running clocks onto airplanes
checkmate, aeronautics engineers
[QUOTE=Ninja Gnome;52850563]so if matter is attracted to slower relative time why don't we just put slower running clocks onto airplanes
checkmate, aeronautics engineers[/QUOTE]
because then the earth would be attracted to the airplanes, duh
This video explained a bunch of stuff I already knew, but it contextualised it in a really good way.
After years I finally actually understand intuitively why curved space time causes gravity, it actually makes sense now.
[QUOTE=Landclad;52854780]Sorry if this sounds silly, but how does time work as...a dimension? If I understood it correctly. I mean, I didn't read any of Einstein's theory (besides what was on this video) so maybe it's explained there but isn't Time relative? Unlike International System units like Meters, Kilograms, etc., which have a fixed amount (as in, the Kilogram is a physical thing that exists, as is a meter, it is objective). What am I missing here?[/QUOTE]
You can measure time just like space
[QUOTE=Landclad;52854780]Sorry if this sounds silly, but how does time work as...a dimension? If I understood it correctly. I mean, I didn't read any of Einstein's theory (besides what was on this video) so maybe it's explained there but isn't Time relative? Unlike International System units like Meters, Kilograms, etc., which have a fixed amount (as in, the Kilogram is a physical thing that exists, as is a meter, it is objective). What am I missing here?[/QUOTE]
well time does have a measurable standard, which is the second. the standard unit of time is one second and it can be broken up into smaller segments, such as a millisecond, or combined into larger ones, such as a minute.
as for it being the 4th dimension, it's pretty simple to understand, really. objects can move around in space and, theoretically, also in time. you can move up, down, left, right, forward, and backward-- 3 dimensions of space-- and you are also constantly moving forward in time.
as for it being spacetime, take a look at this graph:
[img]https://i0.wp.com/www.aschoonerofscience.com/wp-content/uploads/Graphs.jpg[/img]
time and space are part of the same "thing", essentially. that's why time travel can theoretically be possible.
the first graph is your movement through space, and the second through time (obviously). when you combine the two together, you get movement in spacetime. what's important here is the idea that if you were moving through MORE space, you'd be moving through LESS time, because that third graph would be more weighted heavily towards the space side, right? so if you were moving really, really, really fast through space (as in like 99.999...% the speed of light) then your movement through time would slow down, and if you were to be travelling at light speed (which is the MAXIMUM speed you could theoretically move through space) then the graph would have zero movement through time, and so time would stop for you. thus, if you moved faster than the speed of light somehow, you'd go backwards in time because the graph would look like this:
[img]https://cdn.discordapp.com/attachments/269727946137272330/376507074428796928/time_and_space.png[/img]
Down is the direction in which my life is going.
why is it that despite having to pretend to understand them vsauce videos always make me feel smarter
So, theoretically, going skydiving (free falling) allows you to stop experiencing time?
[QUOTE=ForgottenKane;52848316]"An Airor"
goddamnit michael[/QUOTE]
he's the lamest/dorkiest and coolest person alive at the same time
a duality of oxymoronic nature
[QUOTE=ThePanther;52863410]So, theoretically, going skydiving (free falling) allows you to stop experiencing time?[/QUOTE]
if you skydived into a black hole then sure
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