I. Hubeny Does anyone from the panel have a theme question to start with today?V. Trimble It's another one-liner: From an active galaxy meeting many years ago when people talked about spiral structure. I was reminded by Dr. Rucinski's talk of Lodewijk Woltjer's remark: “The larger our ignorance, the stronger the magnetic field.”

I. Hubeny Today, the discussion will be open to the general audience. In Sessions C, D, and E, we have talked about models and modelling techniques so I expect the discussion will focus on these topics.

I. Hubeny Welcome to the last panel meeting. We invite general comments either from the audience or from the panelists. V. Trimble Well, Mercedes started us with a vocabulary item and I think I would like to end with a vocabulary item. When they were first discovered, we called them ‘extra solar system planets’ which was descriptive and fine, but it's just rather cumbersome. At some point they became ‘extra solar planets.’ Now I have never seen a planet inside the Sun. And therefore ‘extrasolar’ is not a good descriptor. ‘Exoplanets’ is OK, but now that there are so many of them that perhaps they are simply ‘the planets.’ When you want to specialize to ours, you could say ‘solar system planets.’ Think how much ink it would save.

M. Richards: Several talks today have expressed fuzzy boundaries to describe the objects called “stars.” Is the following classification correct? Are stars restricted to objects that have masses greater than 0.089 solar masses and begin making energy with hydrogen burning? Do we include the stellar remnants: the white dwarfs and neturon stars? Do we include the brown dwarfs because they burn lithium or deuterium. We know that planets are not in this group since they have no energy production.

Annals of the New York Academy of SciencesVolume 111, Issue 3 p. 871-876 PANEL DISCUSSION—I William W. L. Glenn, William W. L. Glenn Chairman, Yale University School of Medicine, New Haven, Conn.Search for more papers by this author William W. L. Glenn, William W. L. Glenn Chairman, Yale University School of Medicine, New Haven, Conn.Search for more papers by this author First published: June 1964 https://doi.org/10.1111/j.1749-6632.1964.tb53156.xAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Volume111, Issue3Cardiac PacemakersJune 1964Pages 871-876 RelatedInformation