[meteorite-list] FW: Rocks from Space Picture of the Day - May8, 2010
From: Sterling K. Webb <sterling_k_webb_at_meteoritecentral.com>
Date: Sat, 8 May 2010 14:51:58 -0500 Message-ID: <47C330DFEDF34D519645CE34CBB4DCB9_at_ATARIENGINE2> Dear List and Mystery Object Fans Everywhere, First, what IS a "flanged button"? It is not just a rounded shape with a fringe around its edge. It is a shape that forms at a specific stage of the ablation of a solid spheroid shape at high speed. The formation of flanged buttons was unriddled by the aerodynamic analysis done by Dean Chapman while working for NASA in the early 1960's. A quote: "To Dean it was fairly obvious that one face of the button tektites had been melted by aerodynamic heating and the viscous liquid surface thus formed had been swept back, like the waves of the sea, by aerodynamic forces. Indeed, in an arc-jet tunnel, using actual tektite material, he was able to produce a tektite button, complete with ring waves, that was almost identical with the better preserved of the natural specimens found in Australia. Natural tektites, cut in half, revealed flow lines in the surface material from which flight speed could be deduced; and it also became clear that, for the most part, the buttons had originally been spheres, a shape acquired following a previous melting." --- From SP-4302 Adventures in Research: A History of Ames Research Center 1940-1965: http://history.nasa.gov/SP-4302/ch3.4.htm Take a look at Illustration 383 on that webpage which shows a "research" flanged button and a natural one. Identical. Here is a diagram showing the formation of ablative shapes by stages from a molten sphere in flight. Item F is the stage of the flanged button shape: http://originoftektites.com/resources/Figure16.GIF This is from John O'Keefe's "Tektites and their Origins," 1976. The project has "stalled" before posting the complete book, but the first six chapters can be found online at: http://originoftektites.com/ But a flanged button with a hole in it? That's pretty strange. Has there ever been a flanged button with a hole? Well, there has been found a flanged button that was a hollow bubble! Look at page 42 of this: http://adsabs.harvard.edu/full/1966Metic...3...35B So, what would happen if an ablating molten hollow bubble of a flanged button burned through, connecting the hollow with the ablating surface? That question, too, is answered in this paper. There is one example of this and the burn-through was only a narrow tunnel, not the "asymptotic" shape in the RSPOD. One difficulty with the RSPOD shape is, while it starts from what have been the ablative face, it has turned the "object" inside-out. This would require "plastic flow" of the entire object as molten iron. There's one problem right there. Iron meteorites do not melt all the way through. Is this piece small enough to have melted completely without being instantly ablated away in a hot flash of the oxygen blowtorch of the atmosphere? I doubt it. One possibility: the "burn-through" could have occurred by ablating atmosphere contacting an internal troilite nodule and cutting through very fast, melting the entire object and turning it inside-out. It's about a one-in-a-trillion chance. Another suspicious circumstance is the apparent uniformity of the thickness of the metal everywhere the shape is preserved, everywhere except the edge of the "flange." This is highly improbable in a "natural" object, but universal in the case of any manufactured objects. The final nail in the coffin, for me, is the absence of "ring-waves." ANY molten sphere will develop ring-waves. No way not to. There is no trace, not even a relict impression, trace or palimpsest of any ring waves. Button line: this object was not shaped by aerodynamic forces in atmospheric flight and likely is not a meteoritic object. It's a Wrong. Sterling K. Webb ------------------------------------------------------------------------ ----- Original Message ----- From: "Galactic Stone & Ironworks" <meteoritemike at gmail.com> To: "JoshuaTreeMuseum" <joshuatreemuseum at embarqmail.com> Cc: <meteorite-list at meteoritecentral.com> Sent: Saturday, May 08, 2010 11:11 AM Subject: Re: [meteorite-list] FW: Rocks from Space Picture of the Day - May8, 2010 > Hi All, > > Flanged buttons of this type are limited to tektites, which undergo a > vastly different formation process than meteorites. There are no > meteorite flanged buttons, or if there is, I have not seen in during > my experience of handling thousands of meteorites and seeing photos of > tens of thousands of meteorites. Nor I have ever read anything in the > scientific literature that allows for meteorite flanged buttons of > this type. > > This is either a meteorwrong, or a million-dollar find of the century > - I'd bet on the former. > > Best regards, > > MikeG > > > On 5/8/10, JoshuaTreeMuseum <joshuatreemuseum at embarqmail.com> wrote: >> Why would you even think that's a meteorite? I think Darren called >> it. >> It's a snap fastener. >> >> >> >> Phil Whitmer >> >> ______________________________________________ >> Visit the Archives at >> http://www.meteoritecentral.com/mailing-list-archives.html >> Meteorite-list mailing list >> Meteorite-list at meteoritecentral.com >> http://six.pairlist.net/mailman/listinfo/meteorite-list >> > > > -- > ------------------------------------------------------------ > Mike Gilmer - Galactic Stone & Ironworks Meteorites > http://www.galactic-stone.com > http://www.facebook.com/galacticstone > ------------------------------------------------------------ > ______________________________________________ > Visit the Archives at > http://www.meteoritecentral.com/mailing-list-archives.html > Meteorite-list mailing list > Meteorite-list at meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list Received on Sat 08 May 2010 03:51:58 PM PDT |
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