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This theory describes space as an extremely fine fabric "woven" of finite loops called spin networks. The evolution of a spin network over time is called a spin foam . The characteristic length scale of a spin foam is the Planck length , approximately 1.616×10 −35 m, and so lengths shorter than the Planck length are not physically meaningful ...
A schematic diagram of a laser interferometer Though the Hulse–Taylor observations were very important, they give only indirect evidence for gravitational waves. A more conclusive observation would be a direct measurement of the effect of a passing gravitational wave, which could also provide more information about the system that generated it.