A Caltech Library Service

Optical and radio astronomy in the early years

Greenstein, Jesse L. (1984) Optical and radio astronomy in the early years. In: Early Years of Radio Astronomy: Reflections Fifty Years After Jansky's Discovery. Cambridge University Press , Cambridge, pp. 67-81. ISBN 9780521616027.

[img] PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


Radio noise from space was detected by Karl Jansky in 1931, working at the Bell Telephone Laboratories (Jansky 1933). This revolutionary discovery broke the barrier confining astronomical knowledge to the information contained, and the relevant physics, within the narrow band of wavelengths accessible (an octave and a half), and to positions and motions under purely gravitational forces. Jansky's wavelength was ten million times longer than that of light. His signals were radiated from the galactic center, 10,000 parsecs distant. The long wavelengths he used resulted in low angular resolution. There was no radial velocity information, no sharp spectral features (the first line was found twenty years later). For such reasons, and perhaps because he was an electrical engineer, no astronomer beat a pathway to his door; in fact I have never met any astronomer who personally knew him. Public recognition came only as an article in the New York Times (May 5, 1933) and a radio interview. His relevant bibliography includes only seven entries over the years 1932 to 1939, and he died young (see the article by Sullivan in this volume for further information on Jansky). As a summer resident of New Jersey seashore resorts in the early 1930s, I wore golf knickers, possibly even a hip flask, and drove an open car with a rumble seat (oh nostalgia!) past the giant antennas of the transatlantic radio transmitters for which Jansky's studies of noise background were to find the best operating wavelengths. Although I felt no premonitory twinges, I met my wife there, soon became interested in Jansky's results, and my life became linked with that place and time.

Item Type:Book Section
Additional Information:© 1984 Cambridge University Press.
Record Number:CaltechAUTHORS:20150316-103355782
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55781
Deposited By: Joy Painter
Deposited On:16 Mar 2015 17:44
Last Modified:03 Oct 2019 08:08

Repository Staff Only: item control page