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Index of Subjects Thanks for the key word & URL Patrick. ----- Original Message ----- From: "Patrick Kelly" <Patrick.Kelly@Dal.Ca> To: <naturens@chebucto.ns.ca> Sent: Monday, July 27, 2015 8:24 PM Subject: Re: [NatureNS] Pluto > Given that Delta Gem is a brighter star, I'm pretty sure that what you are > seeing is an Airy disk, caused by the wave nature of light. > > https://en.m.wikipedia.org/wiki/Airy_disk > > Pat > > Sent from my iPad > >> On Jul 27, 2015, at 8:11 PM, "David & Alison Webster" >> <dwebster@glinx.com> wrote: >> >> Dear All & especially Astronomy fans, July 27, 2015 >> While going through old National Geographic Magazines I came across a >> reproduction of Clyde W. Tombaugh's plate which led to his discovery of >> Pluto (N.G. 138 (Aug 1970):191). >> >> On this plate, Pluto is just a tiny dot but what caught my eye was a >> haze-free field concentric around a star (Delta Geminorum) and with a >> crisp perimeter encased in a relatively wide haze halo that gradually >> fades to background. >> >> I am wondering if this is some kind of artifact. If so how does it come >> about ? And if not what does it represent ? >> >> If anyone is prepared to look at this file let me know. >> >> Also is it legal to post copyrighted images, such as this, on internet >> sites without authorization ? >> >> Yt, Dave Webster, Kentville >> >> I have this image in a PDF file (only 555 kb) but am wary, for >> copyright reasons, of posting it on Flickr. > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2015.0.6081 / Virus Database: 4392/10319 - Release Date: 07/27/15 >
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