The November / December 2013 issue of Horizons is now online at www.aiaahouston.org/newsletter (50 pages in an 11 MB PDF file). Horizons is the newsletter of the Houston Section of the American Institute of Aeronautics and Astronautics (AIAA). The cover story is, “Potentially Hazardous Obect (PHO) 2013 TV135,” by Daniel R. Adamo, Astrodynamics Consultant. Articles include, “The Enigmatic Giant Polygons of Mars,” by Dr. Dorothy Z. Oehler, “Short Report from the Golden Spike Workshop,” by Larry Jay Friesen, “The 15th Anniversary of the International Space Station,” by Olivier Sanguy, la Cite de l’Espace, “Comet ISON: AWOL,” by Dr. Patrick E. Rodi, the first in a series of columns by Wes Kelly, Triton Systems LLC, and many more regular features. Articles from the JSC Astronomical Society include, “Building an Astronomer’s Chair,” by James Wessel, “The Antarctic Search for Meteorites,” by Dr. Stanley G. Love.