While researching a topic, a student has taken the following notes:
* Ancient Native American and Australian Aboriginal cultures described the Pleiades star cluster as having seven stars.
* It was referred to as the Seven Sisters in the mythology of ancient Greece.
* Today, the cluster appears to have only six stars.
* Two of the stars have moved so close together that they now appear as one.
The student wants to specify the reason the Pleiades' appearance changed. Which choice most effectively uses relevant information from the notes to accomplish this goal?
Difficulty: Medium
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