NOSHA Meets in Remote Livingston Location to Learn About LIGO
|Dimples in Spacetime|
Many, if not most of the advances in the discipline of science and its utilitarian child technology have come from man’s ability to devise new ways to observe, measure and record the physical world around him—and the worlds beyond his own.
At last count, there are five space observatories in Louisiana, all but one resemble the image most visualize when hearing the term, of an igloo- or dome-shaped building with a the barrel of a telescope jutting out at an angle. It works on the very old math of focal lengths and the craft of lens making. Thanks to this measuring stick (and Galileo, of course) we know that we are not at the center of our solar system, much less the universe.
The fifth space observatory is an example of a new way to observe nature. It was conceived, designed, and constructed for the purpose of observing, unlike telescopes, phenomena that are invisible. And not only invisible, but, at the time, were only known to exist as a necessary consequence of Einstein’s Theory of General Relativity. The phenomena are gravitational waves, the ripples in spacetime proposed by the theory that undulate outward from a large celestial events.
In April, about fifty NOSHA members went on a field trip to the Laser Interferometer Gravitational Wave Observatory (LIGO) ten miles or so north of Livingston, La., for their monthly educational meeting, and got a first hand experience and tour of how it works. The LIGO operation is funded by the National Science Foundation and operated by Caltech and MIT universities, with assistance from students and staff from LSU. An identical facility is located in Hanford, Washington; the idea being that with two observatories, any errors in measurements at either location—false positives—caused by local conditions or glitches would be cancelled by the other.
|In the Control Room|
So how do we observe something we cannot see (or is not detectable by any of our other four basic senses)? This is possible by observing the effects the phenomenon. In the case of the LIGO observatory, two 4-kilometer arms resembling inverted concrete half-pipes radiate at a 90° angle from a common point from within which a laser beam is sent traversing through a vacuum tube and reflected back to the center by suspended ultra fine mirror.
|Heading toward the Vanishing Point|
|NOSHA brought a few scientists and engineers of our own!|
Thanks to Charlotte for putting this together and everyone who helped with the carpooling!