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420binchicken t1_j1gpqoh wrote

Reply to comment by TLRsBurnerAccount in Did you know it will still take 46 billion years to cross the universe at the speed of light? 65 mph = 4.8 * 10^17 years! by NotAndroid545

AFAIK that’s not really how it works. For them, they are the centre point at which the universe is expanding from. It’s all relative to your own frame of reference. No solar system is more on the ‘edge’ of the universe than any other.

Please someone correct me if that’s wrong. Space is big and weird.

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inventionnerd t1_j1gs85e wrote

This is true if we're going off the belief the universe is infinite. Then yes, everyone can only see in a 46b radius and are therefore at the "center" of their universe.

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sbrt t1_j1gtcr9 wrote

It was explained to me that it is the 3d equivalent of a 2d creature living on a globe that is expanding. I can imagine that but I have no idea if it is accurate.

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ZincMan t1_j1i1jce wrote

Can we judge our location in relation to the “true” center of the universe ? I mean I assume if the Big Bang was centralized, there must be a “core” to that expansion where everything is expanding radially outward…. But now that I think about it, it still might appear as though everything in relation to you is leaving your observable edge of the universe at equal speed regardless.

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inventionnerd t1_j1i2ctp wrote

It wasnt centralized though. Basically the current theory is the universe is/was always infinite and is just a bigger infinite now. The mass might have been far denser and closer together before the space expansion, but it wasnt in like a 1 mm radius sphere or something. It was always in an infinitely sized space.

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gtga1976 t1_j1i4b96 wrote

That's space itself though yes? I assume the mass within space shows differential in red shift relative to earth based on some other central point? Or are you saying everything is travelling away from earth at the same speed?

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inventionnerd t1_j1i8w3u wrote

Not quite sure what you're saying, but no, everything isn't traveling from Earth at the same speed. But I'm saying wherever you are in space, you'd see the same frequency if you look far enough as you see on Earth? So, our observable universe is about 46b lightyears in radius. To us, we're at the center right? We see a redshift of x when looking straight "up" to the very edge of our universe. If we can teleport to this this spot instantly and look around us, we'd still see a universe of about 46b lightyears in radius (just would be mostly different things as you could see from Earth. If you then looked straight "up" from this spot, you'd still see the same redshift of x as you saw when you looked at your current spot from Earth. So, how could you ever tell what the central point is if everywhere you go, you'd have the same size observable universe and same shifts?

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