The dark central part of a sunspot
Crossword Clue

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AnswerCrossword Clue
umbraThe dark central part of a sunspot
umbralthe dark central portion of a sunspot
umbrasthe dark central portion of a sunspot
umbraethe dark central portion of a sunspot
penumbralshaded region surrounding the dark central portion of a sunspot
penumbraeThe less dark outer part of a sunspot, surrounding the dark core
penumbrasThe less dark outer part of a sunspot, surrounding the dark core