Why can't earth's shadow have only an umbra and not a penumbra?

Anonymous

∙ 9y ago

Updated: 8/21/2019

Actually the earth's shadow has both. This is caused by the sun, not the earth.

The umbra is the dark shadow produced when the sunlight is totally blocked.

The penumbra is the partially lit shadow produced because the sun is not a point light source.

Wiki User

∙ 9y ago

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