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	Io (moon) is a featured article; it (or a previous version of it) has been identified as one of the best articles produced by the Misplaced Pages community. Even so, if you can update or improve it, please do so.
	This article appeared on Misplaced Pages's Main Page as Today's featured article on October 9, 2004.
Article milestones Date Process Result November 25, 2003 Featured article candidate Promoted September 6, 2005 Featured article review Demoted June 3, 2007 Good article nominee Listed June 21, 2007 WikiProject peer review Reviewed July 30, 2007 Featured article candidate Promoted March 10, 2008 Featured topic candidate Promoted September 4, 2008 Featured topic removal candidate Demoted September 4, 2008 Featured topic candidate Promoted July 17, 2009 Featured topic candidate Promoted July 17, 2009 Featured topic removal candidate Demoted June 19, 2021 Featured topic removal candidate Demoted A news item involving this article was featured on Misplaced Pages's Main Page in the "In the news" column on May 13, 2011. Facts from this article were featured on Misplaced Pages's Main Page in the "On this day..." column on January 7, 2009, January 7, 2010, January 7, 2011, January 7, 2014, January 7, 2015, January 7, 2016, January 7, 2017, January 7, 2018, January 7, 2020, January 7, 2022, and January 7, 2023. Current status: Featured article

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To-do: E · H · W · RUpdated 2008-10-09 There are no active tasks for this page This article is now an FA, but the article can always be improved: Add articles links for each citation (preferably using DOI links to keep the article size down). --Volcanopele (talk) 06:26, 8 October 2008 (UTC) Update article with info from New Horizons and other recent papers. --Volcanopele (talk) 03:25, 9 October 2008 (UTC)

Text and/or other creative content from Io (moon) was copied or moved into Basalt. The former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted as long as the latter page exists.

Note

Galileo himself noted that Marius used the Julian calendar while Galileo used the Gregorian one. This is not made clear as it is. Of course, the two calendars and the different parties using them are well known. — Preceding unsigned comment added by 92.26.0.234 (talk) 14:26, 22 September 2014 (UTC)

The date of Galileo's publication, 1610, is not logical proof that he made any observations before Marius. Galileo's direct argumentation should be used. I think his argumentation is indeed proof that he did have priority, not that it is very important. — Preceding unsigned comment added by 92.26.0.234 (talk) 14:34, 22 September 2014 (UTC)

Logical or not, publication was traditionally used to determine priority as it was the first evidence that was available to people in general (and possibly because it encouraged people to publish?)

IceDragon64 (talk) 23:06, 20 January 2019 (UTC)

Water on Io

The introduction states that Io has the least amount of water of any celestial body; that would include the Sun, planet Venus and the tiniest asteroids. A user held a hot debate about that topic on Tbayboy's talk page and this link provided by the user states there might a sub-surface ocean on Io just like on the other Galilean moons. Maybe the introduction should better say Io has the least water out of all moons, that would certainly be true (if the assumption of a sub-surface ocean is wrong), but not every celestial body. Come on! Io can't have less water than the Sun or tiny asteroids, can it? -- 12:34, 6 May 2019 (UTC)

Some more context: There's a statement in Surface Composition saying "Io has the least amount of water of any known body in the Solar System", with a reference to a published textbook. It's also repeated in the lead.

My own comments:

• The German page above doesn't seem reliable: Given Io's constant volcanism, any sub-surface ocean would be coming out with the eruptions and would be spewed across the surface or in the plumes. It would be easily seen. I think the author got confused reading about Io's possible sub-surface magma ocean and its comparison with the water oceans of the other moons.
• Does the source say Io has the least total mass of water, or the least fraction? It's hard to believe that Io, dry as it is, has less water than some little asteroid.
• If it's water fraction, wouldn't the Sun have less? Or was it implicit in the source that the Sun was excluded?
• Most importantly, is there any data on the quantity/fraction of water in all known bodies for this statement to have any meaning? I find it hard to believe they even know how much water Io has at all, if you include possible internal supplies.

It's certainly worth noting how dry Io is, but saying it has the least water seems a stretch. Could somebody with access to the source (Seeds, Michael A.; Backman, Dana E. (2012). The Solar System (8th ed.). Cengage Learning. p. 514. ISBN 9781133713685) please check it? Tbayboy (talk) 15:36, 6 May 2019 (UTC)

Sub-surface MAGMA ocean, not water. Based on spectroscopic measurements going back to the 1970s all the way through Galileo NIMS have found no evidence for water ice on Io beyond some evidence for hydrated minerals north of Gish Bar Mons, though other molecules are possible candidates including SO3 and S2O (or other polysulfoxydes) (Doute et al. 2004). Is it possible there is water locked in Io's interior? Sure, I guess anything is possible, but this is a world that literally spits its interior out into space and back onto its surface. If there was water in its interior, it should have been observed either through spectroscopy of surface frosts and volcanic plume deposits or by observing Io's plumes as they transit a star. At least water vapor has been found at the Sun... Volcanopele (talk) 20:20, 6 May 2019 (UTC)

The source claims there might be a water ocean beneath Io. On the Sun, where does the water vapor come from? -- 06:41, 7 May 2019 (UTC)

I think that source is wrong: they confused magma ocean with water ocean. It's just a pop-sci website, and I couldn't find anybody else making that claim with a quick google. On the Sun, there's lots of hydrogen and a bit of oxygen, and they cool enough to combine for a while in sunspots. Tbayboy (talk) 11:53, 7 May 2019 (UTC)

The source might err, but I still don't believe that Io has less water than 10-feet-long meteoroids. 212.186.0.174 (talk) 13:52, 7 May 2019 (UTC)

10-feet long meteoroids can have a lot of water. Ruslik_Zero 06:20, 8 May 2019 (UTC)

More than Io has? 212.186.0.174 (talk) 08:28, 8 May 2019 (UTC)

If you see my question why don't you respond? If you don't know, say that you aren't sure. 212.186.0.174 (talk) 11:04, 10 May 2019 (UTC)

We (obviously) don't know the hard numbers. There may not even be any numbers. But Misplaced Pages goes by sources, not what we surmise, and all the reliable sources say Io is about as dry as it gets. Asteroids, generally, aren't that dry (water is bound up in the rock). Without any reliable sources to the contrary, we go with what the one referenced in the article says. I would like to check that the statement here matches the source, but don't have access to the source. Tbayboy (talk) 12:06, 10 May 2019 (UTC)

I think it's anyway unwise to mention the absolute amount of water rather than the amount relative to the size of the body. If one mentioned the latter one I think Io has a higher percentage of water than the Sun or Venus. 212.186.0.174 (talk) 17:07, 10 May 2019 (UTC)

If you can find a reliable source stating the moon Io has water, or any facts about the amount of water on IO, then link it and edit the article, but if we can't find a reliable source , we can't add it. MaximusEditor (talk) 09:25, 24 September 2020 (UTC)

FA sweeps

There are some issues with the article including over a dozen cn tags, some issues (the ones that I found are marked in the article), and some verifiability issues with page ranges of 20 pages or more. (t · c) buidhe 08:31, 13 February 2022 (UTC)

Requested move 17 September 2023

It has been proposed in this section that multiple pages be renamed and moved. A bot will list this discussion on the requested moves current discussions subpage within an hour of this tag being placed. The discussion may be closed 7 days after being opened, if consensus has been reached (see the closing instructions). Please base arguments on article title policy, and keep discussion succinct and civil. Please use {{subst:requested move}}. Do not use {{requested move/dated}} directly. Links: current log • target log • direct move

• Io (moon) → Io
• Io → Io (disambiguation)

– The moon, which played a pivotal role in our early understanding of the solar system, is clearly the primary topic by long term significance. It also appears to be primary by page views; it received around two thirds of the views of all topics with the name Io in the past year, and around three times as many as the next most common, Io (mythology). Even when we include .io, which is differentiated by the lowercase and by the dot per WP:SMALLDIFFS and thus isn't directly relevant to what the primary topic for Io is, it receives approximately half of the total views for all topics, and about twice as many as .io itself. BilledMammal (talk) 07:09, 17 September 2023 (UTC)

• Oppose per consistency. Except for the planets (and Pluto) that are named after mythological figures, the base name tends to be a disambiguation page: Europa, Callisto, Ganymede, Ceres, Vesta, Pallas, Eris, Sedna, Titan, Rhea, Tethys, Triton... Egsan Bacon (talk) 15:59, 17 September 2023 (UTC)

  WP:CONSISTENT says explicitly that we do not strive for consistency when it comes to requiring disambiguation. Orange (color) doesn't necessitate Red (color). This is literally policy. Red Slash 18:57, 17 September 2023 (UTC)

• Support as proposed. Well said, both criteria of PRIMARYTOPIC lean this way. Red Slash 18:55, 17 September 2023 (UTC)
• Weak support. The film looks like it is really IO (film) (I'll follow up with another RM once this is one is decided), so it's really between the moon and its namesake. Even discounting the film, the page view advantage isn't huge, especially given the number of other topics with this basename, and WikiNav shows the two are nearly equally sought by users reaching the dab page, which is a non-trivial number, ~5k. I think there are long-term signicance arguments on both sides. All in all I think this could go either way, but the page views do weigh slightly in favor of making the moon the primary topic. Probably the disambiguation regarding all major moon articles should be revisited with this sort of analysis. It shouldn't necessarily be that planets win out over deities but moons generally do not as it currently seems; every title should be examined by primary topic criteria individually. Of course the problem is that some titles like Europa have a lot of other uses to consider. Mdewman6 (talk) 23:15, 17 September 2023 (UTC)
• Oppose per Egsan Bacon. Also, there are 62 entries listed upon the Io / IO / iO / I/O / i/o / i.o. disambiguation page — too many for one topic to be presented as primary over the combined notability of the remaining 61 entries. —Roman Spinner (talk • contribs) 00:34, 18 September 2023 (UTC)
• We already place it among the two entries at the top, and https://wikinav.toolforge.org/?language=en&title=Io indicates that these two meanings take the lion's share of outgoing clickstreams, each the same ratio, which certainly doesn't indicate that the moon is primary over the other meanings. The computing concept of IO has at least a comparable amount of long-term significance in its field. This actually indicates that other meanings with significance are effectively being hidden from view by being part of the huge list below. In any case, I think we need a better rationale than this to make a change. (Oppose) --Joy (talk) 08:35, 18 September 2023 (UTC)

  IO is differentiated by WP:SMALLDIFFS; it will, of course, still redirect to Io (disambiguation). BilledMammal (talk) 08:42, 18 September 2023 (UTC)

  But that doesn't matter for the purposes of this discussion - IO redirects to Io already, presumably because we expect the average user to type "io" when they might mean "IO" often enough, which in turn does not seem like an unreasonable expectation. --Joy (talk) 11:27, 18 September 2023 (UTC)

  I assume it's because there is no primary topic for IO; for example, the movie using that stylization. BilledMammal (talk) 11:32, 18 September 2023 (UTC)

• Support per WP:PRIMARYTOPIC. Rreagan007 (talk) 21:32, 18 September 2023 (UTC)
• Oppose per consistency and views arguments above. There is no primary topic. -- Netoholic @ 01:24, 19 September 2023 (UTC)

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