Talk:South Pole–Aitken basin

message: A minor point here, but the article mentions that the Chryse Basin of Mars is "the only impact basin close to it in size". However, Chryse isn't the largest such structure on it's own planet. Further confusing the situation (and potential readers) is the fact that the Wikipedia entry on Hellas Planitia makes mention of the fact that it is the largest impact basin on Mars.
:Also, what about Valhalla (crater) on Callisto? It's 3800 km in diameter according to its entry. Orcoteuthis (talk) 15:20, 20 January 2008 (UTC)
replies: text: Valhalla isn't really 3800 km in diameter.  That's the radius of the most distant confirmed ring (a structure external to the crater proper).  This value is listed because it's not immediately clear where the actual crater is at Valhalla.  Most of SPA's rings have now degraded, so the diameter listed is actually the diameter of the crater proper.  So yes, SPA is bigger than Valhalla.Rppeabody (talk) 06:18, 12 March 2011 (UTC)
thread_title:  What about Hellas? 

message: http://web.mit.edu/newsoffice/2008/mars-basin-0625.html
"The giant basin that covers about 40 percent of the surface of Mars, sometimes called the Borealis Basin, is actually the remains of a colossal impact very early in the solar system's formation, the new analysis shows. The basin, 8,500 km across and 10,600 km long, is larger than the combined area of Asia, Europe and Australia, and about four times wider than the next-biggest impact basins known, the Hellas basin on Mars and the South Pole-Aitken basin on the moon."  —Preceding unsigned comment added by 74.65.224.74 (talk) 05:26, 14 August 2008 (UTC)
thread_title:  What about Borealis Basin? 

message: Anyone have information on how large the meteor that cause this crater was?  —Preceding unsigned comment added by M00npirate (talk • contribs) 19:01, 5 December 2008 (UTC)
replies: text: It's been over 6 years since this was asked, but it's still relevant and could do with being answered Fig (talk) 11:28, 15 March 2015 (UTC)
replies: text: Nobody knows. An estimate, based on hypothesis that magnetic anomalies on the north of the basin are result of impactor's iron, it was iron-rich asteroid 160–200 km in size, and other estimates (1, 2, 3), based on basin's morphology, say about 500–800-km low-density body. Stas (talk) 15:39, 15 March 2015 (UTC)
thread_title:  Size of the meteor? 

message: According to the Mars wikipedia entry, the impact in its northern hemisphere hasn't been validated.
should this situation be described in this article when it's stated that the moons impact is the second biggest in the solar system?--neolandes (talk) 03:04, 24 October 2009 (UTC)
thread_title:  2nd biggest? 

message: I don't believe the Aitken Crater was formed by a meteor at all. It is, rather, a gravity driven depression in response to the major impacts on the other side of the moon.
For a start, the basin shows no central uplift. According to the Wiki page for complex craters, "The collapse of the transient cavity is driven by gravity, and involves both the uplift of the central region and the inward collapse of the rim. "
The lack of central uplift is fairly compelling evidence that the Aitken Basin is not of meteoric origin. Current theory says there is uplift, but only in the mantle.
Stripe 15:17, 18 August 2010 (UTC)
thread_title:  Non-Meteoric Origin? 

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thread_title:  External links modified 

message: This basin may be named Oceanus Glaciem (ocean of Ice), as many names of lunar maria associate with water; basin is comparatively bright (as is ice) and South Pole of Moon may contain ice. Thus, on Moon will be two oceans. --Jugydmort (talk) 20:19, 21 August 2016 (UTC)
thread_title:  Naming 

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thread_title:  External links modified 

message: The article states the depth is 13km, and refers to this citation https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2003JE002182
But this citation says "The basin is approximately 2500 km in diameter and is between 6.2 and 8.2 km deep."
Where does the 13km figure come from?80.194.4.6 (talk) 13:19, 27 June 2020 (UTC)
thread_title:  Incorrect Depth?