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Question

Glowing hydrogen gas from stars, such as the sun, emits specific frequencies of light. However, the frequencies of the light observed from stars in distant galaxies are lower than expected. Construct an explanation for this phenomenon.

Solution

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Requirement

In this exercise, our job is to infer why is light from stars in other galaxies generating different frequency than the sun.

Key concept

Since light has a constant speed c, this means that we're experiencing a Doppler shift from the distant stars, ie. there is a movement that generates the difference in detected frequency.

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