Which frame of reference though? Also time is a dimension should the dog also freeze in time?
this post was submitted on 23 Apr 2025
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because fixed points in space (stationary reference frames) fall inwards into gravity wells as time progresses, Fido, would need to burrow into the center of the earth. Fido should shoot into space like that if told to stay at a fixed point relative to the cosmic microwave background
"but Stephen, there are no fixed points in space. Space is relative, meaning you can only define positions relative to other things. You demand the fundamentally physically impossible of me, Stephen."
Ah, but using the cosmic microwave background we actually can determine a universal coordinate system to fix a point in space.
But only related to the cosmic microwave background, which, while more universal than most other reference frames, is ultimately still arbitrary
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Out of my depth here, but it seems that objective timespace coordinates can be determined while still meshing with relativity.
I'll just leave this here so someone else can explain why I'm wrong:
https://en.m.wikipedia.org/wiki/Proper_time
I know 4D spacetime can be non-euclidean, but I believe those are localized to areas experiencing relativistic extrema.
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Is it tho? Assuming there was a big bang, isnt it fair to call that origin point 0 0 0 in 3D space? Subjective space is relative, but that doesnt mean space itself is relative.
the big bang wasn't an explosion from a point, it was an explosion of a point in space. That one point is still expanding to this day. Everything is moving away from everything else, which wouldn't be the case in an "ordinary" explosion. We are all still in that one point, it's just that that point has expanded. The center of the universe is, in the literal sense of the word "literally", everywhere.
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The big bang created the universe within space. Space is literally, just space, an endless empty (as far as we know) vacuum.
No the big bang also created space time. The bang is the bang of space going from a point to infinite 3d space + time.
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I'm just going to jump on the bandwagon and helpfully say; think of the universe as a large expanding paper bag.
Initially it was flat, but then the bagger expanded it in the third dimension and put bananas in it. Imagine now that you are one of those bananas, but oh no, here comes the 2L Pepsi bottle ready to crush us. Thankfully the bagger takes us out of the bag first, puts the cola bottle in, and then puts us back in on top.
And that's why I believe in God
Uh what?
Think of an expanding balloon as the universe, and the paperbag as the expanding multiverse. Now assuming a uniform conservative rate of 1.5 marvel movies a year, how much does the paper bag fill with vomit before the balloon bursts?
27 ducks?
Think of a balloon expanding. All the dots on the surface are moving away from one another. No dot is the centre.
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the 0 0 0 0 (spacetime) orientation system would be possible if the universe was a minkowski space and thus flat, but spacetime is curvy due to relativistic effects, which prevents any sort of flat orientation like that
So from wherever you look, the universe is expanding away from you (I.e., other things in it move away from you).
Therefore, you can see that the universe doesn't have a centre. From this and some other a bit more complicated things, one can see that the Big Bang never had a single point but rather expanded everywhere at once when it happend. Although often called expansion from one point that is wrong.
Also technically you would need to give a time dimension as we live in 4D space.
So from wherever you look, the universe is expanding away from you
Therefore, you can see that the universe doesn’t have a centre.
No. The only logical explanation is that I am the center of the universe!
So from wherever you look, the universe is expanding away from you (I.e., other things in it move away from you).
Wouldn't that be the case even with a center?
Yes indeed, you could see every point as the universe as its centre (or none of them).
When everything is center, nothing is.
that's not how the big bang works, the whole thing about the big bang is that it was a singularity containing all of space in a single point.
The standard analog is to take a small balloon with dots painted on it, then inflating it. The surface of the balloon is spacetime, and as it shows there is no origin, everything just gets more distant from everything else.
Doesn't the balloon have a centre of mass that we can adjust coordinates to.... all the time.... at millions of km per second.
Okay, I see your point.
They are only talking about the surface of the balloon. For the purpose of the metaphor only the surface exists. Imagine infinite space. Now imagine we divide infinite space into a grid of 1 meter cubes. Now imagine we double the size of every cube. That's more or less how expansion works, it is an expansion of space everywhere, not outwards like an explosion.
I've been struggling to not see it as explosion/outward expansion. This really helped!
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Good boy. Maybe too good.
This makes me sad.
Also, it's a little inaccurate as the dog would be moving at hundreds of thousands of kilometers per hour, either burning up in the Earth's atmosphere or plowing through its surface. Also, I don't think dogs have the ability to do this, so there's that.
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