this post was submitted on 23 Apr 2025
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[–] [email protected] 3 points 4 hours ago

I KNEW YOU THOUGHT I WAS GOOD DOG!!!

[–] [email protected] 22 points 9 hours ago (1 children)

I studied general relativity last year and ACKCHYUALLY...

[–] [email protected] 4 points 4 hours ago

Pfft! I read about it on a box of cereal 5 minutes ago and think I've come to some novel conclusions.

[–] [email protected] 5 points 10 hours ago
[–] [email protected] 190 points 19 hours ago (5 children)

"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."

[–] [email protected] 38 points 16 hours ago (4 children)

Ah, but using the cosmic microwave background we actually can determine a universal coordinate system to fix a point in space.

[–] [email protected] 15 points 9 hours ago

that sounds like you're relating your position to something else 😏

[–] [email protected] 8 points 11 hours ago (2 children)

Why cosmic microwave background radiation? Is that any less arbitrary than e.g. the sun?

[–] [email protected] 2 points 8 hours ago (1 children)

Well, it's the only thing we know of that can be used in the whole universe.

[–] [email protected] 1 points 5 hours ago (1 children)

Use it how? I've never heard about this, and I can't seem to find anything about it by searching

[–] [email protected] 1 points 2 hours ago

In the sense that the Cosmic Microwave Background (CMB) is visible from every point in space. No matter where you are you can determine your position relative to the CMB, making it a common reference point for the entire universe.

[–] [email protected] 3 points 9 hours ago (1 children)

i mean if we were to communicate with aliens in another galaxy it would be the "least arbitrary" one

[–] [email protected] 1 points 5 hours ago* (last edited 5 hours ago)

Wouldn't the conversations go like this?

Me: I'm about 2/3rds out the longest arm of my galaxy

Alien: OK

vs

Me: I'm at the place where the CMBR is evenly redshifted in all directions.

Alien: Huh, me too?

[–] [email protected] 41 points 16 hours ago (2 children)

cosmic microwave

Oh, so that's why Earth is spinning!

[–] [email protected] 2 points 4 hours ago

Life is naught but a warm burrito on the rotating microwave plate of Earth.

[–] [email protected] 5 points 11 hours ago

Yeah, and some asshole thought it'd be cool to put fish in it.

[–] [email protected] 37 points 16 hours ago (3 children)

But only related to the cosmic microwave background, which, while more universal than most other reference frames, is ultimately still arbitrary

[–] [email protected] 5 points 11 hours ago (1 children)

North is arbitrary as well, that doesn't mean you can't use it for spatial referencing.

[–] [email protected] 6 points 10 hours ago

Yes, for practical purposes, absolutely! But you're always just aligning with something else moving through space, not space itself

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[–] [email protected] 17 points 19 hours ago (16 children)

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.

[–] [email protected] 37 points 17 hours ago (3 children)

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.

[–] [email protected] 9 points 14 hours ago (1 children)

Like one of those pills you put in water and it turns into a sponge TRex!

[–] [email protected] 3 points 11 hours ago

Based and T-Rexpilled.

[–] [email protected] 8 points 15 hours ago (1 children)

Im kinda trollin at this point, but in an ordinary explosion, in a vacuum without external gravity, everything would indeed have a different initial velocity and direction, so everything would be moving away from everything else.

[–] [email protected] 21 points 15 hours ago* (last edited 15 hours ago) (1 children)

imagine standing at the side of the explosion looking towards it. some debris will be blown way from you, but some will be coming towards you. You are something, and not everything is moving away from you, some debris hits you in the face. That's an explosion in space.

An explosion of space is defferent. Everything will be moving away from you, regardless of where you are or which side you're facing.

Something wasn't in space and it exploded. Space itself exploded. your argument only holds if you are exactly in the explosion source.

In space, we're still inside the explosion

[–] [email protected] 2 points 11 hours ago

I've given up trying to explain it to people as an explosion. Media and innate biases make people view that word as a "kaboom" and form a mental picture.

I tell people that the universe was likely always infinite. In the beginning it was infinitely dense and essentially a singularity, but that singularity wasn't a point in space like a black hole, it was a everything and everywhere. The universe was ultra dense, infinite energy, then all at once, the whole thing got bigger like the infinite hotel paradox, an infinite space can get bigger. So all the whole infinite space just stretched out in all directions, making space open up and the energy less dense.

[–] [email protected] 10 points 16 hours ago (2 children)

I am the center of the universe. Got it.

[–] [email protected] 2 points 8 hours ago

Wait until you hear about quantum immortality...

[–] [email protected] 1 points 8 hours ago

Objectively based solipsism

[–] [email protected] 52 points 18 hours ago* (last edited 18 hours ago) (4 children)

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.

[–] [email protected] 6 points 16 hours ago

That's absolutely right; there's no special origin point in space where the Big Bang began. However, there is a specific reference frame that the Big Bang occured in, which we can measure by looking at the redshift of the cosmic microwave background left over from it. The solar system is currently moving at around 600km/s relative to that.

Interestingly, this is actually an expanding reference frame due to the universe's expansion, so two observers locally at rest relative to it will each see the other moving away.

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[–] [email protected] 9 points 18 hours ago (4 children)

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.

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[–] [email protected] 5 points 16 hours ago (1 children)

I'm so glad you asked that.

[–] [email protected] 5 points 15 hours ago

Never had that many comments in my inbox

[–] [email protected] 7 points 18 hours ago

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

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[–] [email protected] 7 points 11 hours ago

General relativity is for nerds (this is a joke).

[–] [email protected] 8 points 13 hours ago

Does anyone know the artist?

[–] [email protected] 17 points 17 hours ago

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

[–] [email protected] 14 points 17 hours ago

Which frame of reference though? Also time is a dimension should the dog also freeze in time?

[–] [email protected] 21 points 19 hours ago (1 children)

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.

[–] [email protected] 11 points 11 hours ago (1 children)

We have never truly tested the limits of dogs. Only the limits of what THEY think we want.

[–] [email protected] 3 points 8 hours ago

What they want is to be with us, thus they would never use such a power even if they had it.

[–] [email protected] 20 points 19 hours ago

Good boy. Maybe too good.

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