[Article] The expanding spectrum Adjust Share Space-messengers, missile-detectors, and people-watchers By John L. Chapman, This article is only available as a PDF to subscribers. Download PDF Tags Electromagnetic waves Measurement Radar in astronomy Radiation Space astronomy More from John L. Chapman The uncanny world of plasma physics Adjust Share Close < Previous Issue | View All Issues | Next Issue > July 1964 < Previous Issue | View All Issues | Next Issue > Table of Contents Close