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Guests: John Batchelor, Dr. Alan Hale, Dr. David Livingston: Topics: Comet ISON. You are invited to comment, ask questions, and discuss the Space Show program/guest(s) on the Space Show blog, http://thespaceshow.wordpress.com. Comments, questions, and any discussion must be relevant and applicable to Space Show programming. Written Transcripts of Space Show programs are not permitted without prior written consent from The Space Show (even if for personal use) & are a violation of the Space Show copyright. We do not permit the commercial use of any Space Show program or part thereof, nor do we permit Space Show programs to be edited, placed on YouTube, or other private channels & websites. Space Show programs can be quoted in news articles, papers, academic & research work but must be cited or referenced in the proper citation format. Contact Dr. Livingston for questions about our copyright and trademark policies which we do enforce. This program is archived on The Space Show website, podcasting, and blog sites with permission from John Batchelor. Please visit the John Batchelor Show website for more information about this fine program, www.johnbatchelorshow.com. Remember, your Amazon Purchases Can Help Support The Space Show/OGLF (www.onegiantleapfoundation.org/amazon.htm). During our 11 minute plus discussion, John, Dr. Alan Hale, and I talked about the approaching comet ISON. We talked about the brightness theories representing everything to that of as bright as a full moon to it fizzling out and not being very bright. We talked about the theory on this proposed by Dr. Ferrin, but Alan believed it was still way too early to make accurate predictions about this first time comet from the Ort Cloud. Alan described the sublimation process, its path and flyby near Mars on or about August 20, then on to pass by Mercury and as a sungrazing comet, finally be visible on Earth in late November 2013. Dr. Hale was also asked to describe the tails of a comet, the dust tail and the ion tail. Please post any comments/questions you might have on The Space Show blog. You can contact any of us through firstname.lastname@example.org.