Umbra

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Umbra

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1. The darkest part of a shadow in which light is completely cut off by an intervening object. A lighter part surrounding the umbra, in which the light is only partly cut off, is called the penumbra. </dd>
2. The darker central portion of a sun spot, surrounded by the lighter penumbra. </dd>

References

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