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6 September, 06:17

Penumbra (definition)

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Answers (1)
  1. 6 September, 08:29
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    The partially shaded outer region of the shadow cast by an opaque object

    or,

    The shadow cast by the earth or moon over an area experiencing a partial eclipse.

    or,

    The less dark outer part of a sunspot, surrounding the dark core.

    (The last two are about astronomy which is the branch of science which deals with celestial objects, space, and the physical universe as a whole.)
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