![]() | This ![]() It is of interest to the following WikiProjects: | ||||||||||||||||||||
|
A summary of this article appears in Big Bang. |
Is that what they meant by "Quarter sized"? I was a little confused by that. As for the size... 24.26 mm in diameter.
"In any case, it is interesting to note that the cosmological horizon is a maximal limit of perception and not an actual boundary" ... I'm not sure this is a safe statement: the nature of reality is always relative to an observer. for example, doesn't this in-principle boundary of visibility form an event horizon with an equivalent effect to hawking radiation? Snaxalotl ( talk) 03:47, 11 June 2009 (UTC)snaxalotl
I would like to see some mention here of the size of the Universe, such as can be found on the observable universe article.
I would also like to know what the difference is between the/a Cosmological Horizon and the/a Particle horizon.
I copied some text over myself from the OU article, but it didn't quite fit so I undid it. Nagualdesign ( talk) 04:16, 16 February 2009 (UTC)
Isn't the particle horizon the distance at which are now objects from which we receive the light now, that's to say roughly 50 billion light years, not to confuse particle horizon with Hubble's horizon at 13.7 Gly ? (imagine an object emitting on the Hubble's horizon, the time its light comes to us, it would have moved (faster than light)) —Preceding unsigned comment added by 129.175.69.214 ( talk) 08:56, 31 March 2010 (UTC)
The above seems to conflict with the cited article by Lineweaver and Davis. In the case of a positive cosmological constant, an even horizon exists. — Preceding unsigned comment added by 193.29.76.37 ( talk • contribs)
This article needs a review from an expert. As was stated in another comment, the article by Lineweaver and David points out clearly that the Hubble radius is not an event horizon when the Hubble parameter is not a constant in time (which, in the current accepted cosmological models, it is not). Light emitted from particles at the Hubble radius will still reach us in a finite time. Light emitted from the cosmic event horizon will reach us at infinite time. There is a very subtle difference between the two, but nevertheless an important one. The definitions in the article are partly right, mixed with wrong elements. I am no expert myself, so I will not alter too much. Someone with cosmological authority should. — Preceding unsigned comment added by 78.23.25.41 ( talk) 09:04, 13 June 2017 (UTC)
Links to the 'spacetime' article. What the heck is the point of this link? How does it explain the link text or the rest of the sentence that precedes it? It seems to me this link is spurious and distracting and should be removed. Thanks. Comiscuous ( talk) 20:10, 19 April 2021 (UTC)