Ray

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Ray

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1. An elemental path of radiated energy; or the energy following this path. It is perpendicular to the phase fronts of the radiation. See incident ray, reflected ray, refracted ray. </dd>
2. One of a series of lines diverging from a common point, as radii from the center of a circle. </dd>
3. A long, narrow, light colored streak on the lunar surface originating from a crater. Rays range in length to over 150 kilometers and usually several radiate from the same crater, like spokes of a wheel. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use