Talk:Sun

Edit request- "faint young sun" section

Contrary to the above mentioned section in this article,(Sun#Faint_young_Sun_problem) there is actually NO consensus for the faint young sun paradox. The paper cited in this article is from 1986, since then a number of other papers have been published which categorically dispel the Greenhouse gas explanation.

Like this one published in Nature the journal in 2010 - Examination of Archaean sediments appears inconsistent with the hypothesis of high greenhouse concentrations. Instead, the moderate temperature range may be explained by a lower surface albedo brought about by less continental area and the "lack of biologically induced cloud condensation nuclei". This would have led to increased absorption of solar energy, thereby compensating for the lower solar output.

Solar radius

There was radius 696342 km (last in revision oldid=709886995) as per https://arxiv.org/pdf/1203.4898 - the radius of the layer which is observed by MDI and HMI instruments on SOHO resp. SDO spacecrafts. With this value, there was correctly written: "the Sun's radius is considered to be the distance from its center to the edge of the photosphere, the apparent visible surface of the Sun" .

SDO spacecraft (HMI instrument) uses nominal Solar radius 6.96e8 m exactly.

At Revision oldid=710009490 as of 12:16, 14 March 2016 the value changed to 695700 km, as per IAU burreaucratic decision. In article Solar radius there is correctly stated: "The solar radius is usually defined as the radius to the layer in the Sun's photosphere where the optical depth equals 2/3 ." and also that it is a burreaucratic decision of IAU Resolution B3, and not a real measurement... (for a list of real measurements and their spread, let's see that arxiv 1203.4898 Fig.1 - published measurements of Solar radius)

Anyhow, at this article there stays the previous definition about "edge of the photosphere", which does not correspond with the value 6.957e8 m . It is necessary to correct definition of Radius down in text to read "where the optical depth equals 2/3", and possibly also to mention other values ("to the edge of photosphere 696342 km, to the photospheric layer as observed by MDI at wavelength 6173 A" etc...)

At the very least, shrinking the Sun by 642km should be better explained ! At least by adding "where the optical depth equals 2/3" in the definition of radius down in article text in "Characteristics" section... — Preceding unsigned comment added by 79.98.159.114 (talk) 20:30, 18 April 2017 (UTC)

Semi-protected edit request on 1 May 2017 - math issues

Sun is *not* a sphere. I once edited it out to *ball* which is, by mathematical definition, a sphere + everything inside the sphere. Sphere, by definition, is empty. How can a ball of plasma can be called a sphere? By the way, why is the article locked? I did numerous changes to numerous articles but I don't want any Wikipedia account - edit wars are not for me. If you want to contact me, feel free: dehypnotizer@gmail.com 188.146.3.189 (talk) 23:52, 1 May 2017 (UTC)

Not done You are technically correct, which is the best kind of correct. However, if you look in dictionaries such as Merriam-Webster, Cambridge, MacMillan, or our own Wiktionary, you will find that in standard written English (as opposed to mathematical jargon), "sphere" primarily refers to round bodies as a whole, not just their surfaces. This is the way the word is used in the two sources cited (in one by a solar scientist), neither of which contains the word "ball". So you are a little too technically correct, but it is a very good point all the same, and I like the way you think :) A2soup (talk) 01:08, 2 May 2017 (UTC)

Sun a "dwarf?"

"As such, it is informally referred to as a yellow dwarf."

I have a big problem with this statement. Okay, less so because it's "informally." But the Sun is not an average star. It is, by some measures, about halfway between the biggest and smallest stars, but there are so many more small stars than big stars that they pull the actual average size well below the Sun's size. So can we check this? 50.5.96.209 (talk) 00:34, 8 May 2017 (UTC)

But it is a yellow dwarf, even if that term is a misnomer. VQuakr (talk) 00:45, 8 May 2017 (UTC)

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