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  • Wendie Burroughs

    The Phases of the Moon--A Middle School Science Hands On Lesson

  • Mona Evans

    There are two parts to the Earth's shadow: the penumbra and the umbra. The umbra is darker because Earth blocks the Sun's direct rays, but there is some direct sunlight in the penumbra. You would scarcely notice the subtle darkening of the Moon passing through the penumbra. (Diagram: Fred Espenak) ©Mona Evans, “Lunar Eclipses” http://www.bellaonline.com/articles/art28454.asp

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During a total lunar eclipse, the moon passes through the outer part of Earth's shadow, called the penumbra, and then into the dark umbra. When fully immersed in the umbra, the moon is in total eclipse or in totality. (Credit: Sagredo) Mona Evans, "Blood Moons and Lunar Tetrads" www.bellaonline.c...

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