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Why were phonograph records placed on the sides of the two voyager spacecraft launched in the 1970s?

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Answer:

The reason for phonograph installation is to provide information about humans to interstellar aliens.

Step-by-step explanation:

Phonographs are archaic forms of gramophone which are able to record and reproduce sound.Phonographs were used in early days in voyagers to help transmit information about humans to nearby alien species in space.

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