Learning Path
Question & Answer
Choose the Best Answer
Umbra
Penumbra
Antumbra
Perigee
Understanding the Answer
Let's break down why this is correct
When the Moon reaches the center of Earth's shadow, all sunlight is cut off. Other options are incorrect because The outer region of the shadow still lets some sunlight through, so the Moon would still show a bright edge; The antumbra is a zone that creates a ring of light when the eclipsing body is smaller than the light source.
Key Concepts
Lunar Eclipse Phases
medium level question
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Deep Dive: Lunar Eclipse Phases
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Definition
Lunar Eclipse Phases involve the Earth casting its umbral and penumbral shadows on the Moon. As the Moon enters the Earth's penumbra, it gradually darkens, sometimes turning red due to atmospheric scattering. This phenomenon allows observers to study the relative sizes of the Earth and Moon based on the shape of the Earth's shadow on the Moon, as demonstrated by ancient Greek astronomers.
Topic Definition
Lunar Eclipse Phases involve the Earth casting its umbral and penumbral shadows on the Moon. As the Moon enters the Earth's penumbra, it gradually darkens, sometimes turning red due to atmospheric scattering. This phenomenon allows observers to study the relative sizes of the Earth and Moon based on the shape of the Earth's shadow on the Moon, as demonstrated by ancient Greek astronomers.
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