The content you've requested is available without charge only to active Sigma Xi members and
If you are an active member or an individual subscriber, please log in now in order to access this article.
If you are not a member or individual subscriber, you can:
Einstein's general theory of relativity describes how changes in the configuration of a massive object generate ripples in the fabric of spacetime. These gravitational waves propagate away from their source at the speed of light, causing small undulations in the dimensions of the things they wash over. Evidence for the existence of gravitational waves is robust. For example, they neatly explain why the orbits of some binary star systems are slowly decaying. But nobody has ever detected a gravitational wave directly. That situation may soon change as giant gravitational-wave detectors come into operation. One of those projects is the Laser Interferometer Gravity-Wave Observatory (LIGO), a 300-million-dollar project with facilities in both Washington State and Louisiana. A member of the team of scientists working on LIGO, Shawhan explains what gravitational waves are and how the new generation of instruments might soon be able to detect them.
Connect With Us:
An early peek at each new issue, with descriptions of feature articles, columns, and more. Every other issue contains links to everything in the latest issue's table of contents.News of book reviews published in American Scientist and around the web, as well as other noteworthy happenings in the world of science books.
To sign up for automatic emails of the American Scientist Update and Scientists' Nightstand issues, create an online profile, then sign up in the My AmSci area.
JSTOR, the online academic archive, contains complete back issues of American Scientist from 1913 (known then as the Sigma Xi Quarterly) through 2005.
The table of contents for each issue is freely available to all users; those with institutional access can read each complete issue.
View the full collection here.
Receive notification when new content is posted from the entire website, or choose from the customized feeds available.