How big is the universe?

MrAl

Joined Jun 17, 2014
13,722
Today's cutting-edge theory—quantum gravity—suggests that even space and time aren't fundamental. They emerge from something deeper: pure information.

This information exists in what physicists call a Platonic realm—a mathematical foundation more real than the physical universe we experience. It's from this realm that space and time themselves emerge.


This is simply mind-blowing ... :oops:
Well, remember what the word "suggests" means. My mind is not yet blown :)
 

DC_Kid

Joined Feb 25, 2008
1,242
The universe (space/time) cannot be expanding if you cannot 1st define boundaries. Just because observable and non-observable matter move apart in some infinite fashion, that alone does not mean the universe is expanding.

 

MrAl

Joined Jun 17, 2014
13,722
The universe (space/time) cannot be expanding if you cannot 1st define boundaries. Just because observable and non-observable matter move apart in some infinite fashion, that alone does not mean the universe is expanding.

So the picture of Einstein makes this more believable ?
:)

Not saying this is wrong or right myself though.
 

MrAl

Joined Jun 17, 2014
13,722
How many angels can dance on the head of a pin?
Hi,

(the 2d projected surface area of the head of the pin) divided by (the cross-sectional area of one angel)

unless the angels can stand on the appropriate angles and then the answer is just:
(the surface area of the head of the pin) divided by (the cross-sectional area of one angel)

I'm pretty sure this is a known Biblical concept :)
 

Thread Starter

joeyd999

Joined Jun 6, 2011
6,337
Hi,

(the 2d projected surface area of the head of the pin) divided by (the cross-sectional area of one angel)

unless the angels can stand on the appropriate angles and then the answer is just:
(the surface area of the head of the pin) divided by (the cross-sectional area of one angel)

I'm pretty sure this is a known Biblical concept :)
Do the angels have to physically be touching the head of the pin?
 

cmartinez

Joined Jan 17, 2007
8,786
Astronomers have developed a new way to test one of the central assumptions of modern cosmology — that the universe behaves uniformly on the largest scales. When applying the method to real observational data, the researchers found tentative signs that this assumption may not fully hold, potentially pointing to new physics beyond the standard cosmological model.
 

MrAl

Joined Jun 17, 2014
13,722
Hi,

First, thanks for the summary. That's really important because we don't all have time to watch the videos.

There are a lot of 'new' ideas coming out lately I don't know which ones to believe and which ones not to believe anymore. I end up ignoring them until they come on the 6 o'clock news :)
For all I know they could all be true, but most won't affect me personally for the rest of my life anyway.
 
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