umbra - Hutchinson encyclopedia article about umbra Printer Friendly
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umbra

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umbra

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Shadows are created as light travels in straight lines and so cannot bend around objects, and is therefore blocked.

Central region of a shadow that is totally dark because no light reaches it, and from which no part of the light source can be seen (compare penumbra). In astronomy, it is a region of the Earth from which a complete eclipse of the Sun can be seen.



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