2 quotes about tracers follow in order of popularity. Be sure to bookmark and share your favorites!

I had pulled myself plumb woozy. All the time I was pulling this terrific 'g' load, tracers were getting closer to my plane, until finally I was looking back down someone's gun barrels.

Pappy Boyington
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We predict that other velocity tracers in the same elliptical galaxies will show higher velocities if they are less concentrated toward the galaxy center or if they move on more circular orbits. This is likely to be the case for compact star clusters, which are also observable in the outskirts of elliptical galaxies.

Avishai Dekel
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