Talk:GRB 090423

Supernova
Its still debated whether grbs all come from supernova. Thus the statement that this confirms the births and deaths of stars at that epoch is debatable. —Preceding unsigned comment added by Esheldon (talk • contribs) 20:42, 25 April 2009 (UTC)

"a few degrees west of eta leonis"
Re: the citation needed tag here, could this statement on where it is (or was) located be referenced by the coordinates given in this article? They do seem to suggest it's not far from Eta Leonis. - file lake  shoe  21:06, 30 April 2009 (UTC)

It's not the oldest known anymore (aka new material)
Could someone work out something from this? Thanks. &mdash;Matěj Grabovský (talk) 20:51, 12 June 2009 (UTC)


 * Erm... GRB 090423 is indeed the oldest known object. It says so in the article you've linked to: "Known as GRB 090423, the object is at least 200 million years older than the previous record-holder." --Cryptic C62 · Talk 20:59, 12 June 2009 (UTC)

Citation overkill
Too many citations, especially when you cite sources claiming that it is the oldest. A few is enough, 9 is too many.  Bramble  claw  x   01:24, 4 March 2010 (UTC)
 * Some of the citations used actually contains data to back up the observations done. It was copy-edited to this state, I'm sure it was for the best intention of all the editors involved with the article. --TitanOne (talk) 12:20, 4 March 2010 (UTC)

Still, 9 citations just to prove that it is the furthest object ever seen?  Bramble  claw  x   00:10, 5 March 2010 (UTC)
 * That this is the most distant object ever observed is an extraordinary claim, so it definitely needs multiple citations from distinct sources. As I see it, there is nothing to be gained from reducing the number of citations so long as each one is from a different research team / organization. --Cryptic C62 · Talk 18:27, 10 March 2010 (UTC)

Alright then. I will leave this as is, since I would have no idea which references to keep and which to discard anyways.  Bramble  claw  x   22:42, 10 March 2010 (UTC)

Distance: 13 GLy?
This seems to be inconsistent with: http://upload.wikimedia.org/wikipedia/commons/thumb/b/bd/Velocity-redshift.JPG/250px-Velocity-redshift.JPG (from the Wikipedia page on Hubble's Law). Using this graph and Hubble's law (with H = 67.9), I get a distance of 9.3 Gpc / 30 GLy approx. This is still confortably within the confines of the observable universe, see http://en.wikipedia.org/wiki/Observable_universe — Preceding unsigned comment added by 217.169.229.156 (talk) 09:00, 29 July 2013 (UTC)

You are correct, I've made the edit. It seems light travel distance and proper distance were mixed up before. See also http://en.wikipedia.org/wiki/Observable_universe#Most_distant_objects 82.139.86.180 (talk) 01:46, 8 November 2014 (UTC)

For additional reading, see http://en.wikipedia.org/wiki/Comoving_distance 82.139.86.180 (talk) 02:05, 8 November 2014 (UTC)

Come to think of it some more, maybe we shouldn't mention distance at all in terms other than redshift. It makes very little sense to talk about the distance between the planet earth and the originator of this GRB, when the two never co-existed in the same time. 82.139.86.180 (talk) 02:14, 8 November 2014 (UTC)

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