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Lunar Eclipse Phases
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During a lunar eclipse, a group of students observes the Moon gradually changing color as it passes through the Earth's shadow. One student thinks that this color change is due to the Moon being illuminated by other stars. Which explanation best describes why the Moon appears red during a lunar eclipse?

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Learning Path

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Choose AnswerChoose the Best Answer

A

The Earth's atmosphere scatters sunlight, allowing only red wavelengths to reach the Moon.

B

The Moon is reflecting light from other stars that are not visible during the eclipse.

C

The Earth's shadow blocks all light from reaching the Moon, causing it to turn dark.

D

The Moon's surface is made of materials that change color during an eclipse.

Understanding the Answer

Let's break down why this is correct

When sunlight goes through the Earth's thin air, short blue light is scattered away. Other options are incorrect because Students think stars light the Moon; The Earth's shadow does not block all sunlight.

Key Concepts

Lunar Eclipse
Light Scattering
Earth's Atmosphere
Topic

Lunar Eclipse Phases

Difficulty

medium level question

Cognitive Level

understand

Deep Dive: Lunar Eclipse Phases

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Definition
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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