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Extrasolar Life
Experimental data from a NIST "gap-toothed" frequency comb that are
false colored to indicate the range from low power (red) to high power
(blue). The comb is specially designed for astronomy. Each "tooth" is a
precisely known frequency, and the teeth are widely separated (by 20
gigahertz) in comparison to a standard comb.
Credit: M. Kirchner & S. Diddams/NIST


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