Rainer Weiss Quotes
The waves from all the different parts of a sphere would cancel each other out. You need motion that's nonspherical.
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Rainer "Rai" Weiss is an American physicist, known for his contributions in gravitational physics and astrophysics. He is a professor of physics emeritus at MIT and an adjunct professor at LSU. He is best known for inventing the laser interferometric technique which is the basic operation of LIGO. He was Chair of the COBE Science Working Group.