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In 1974, a radio message was sent out from the Arecibo observatory in Puerto Ric

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In 1974, a radio message was sent out from the Arecibo observatory in Puerto Ric

In 1974, a radio message was sent out from the Arecibo observatory in Puerto Rico towards a globular cluster, 21,000 light-years away. Approximately how far has this message gotten as of today?
A) It's just beyond the Neptune in our solar system
B) It's just passing through the Oort cloud surrounding our solar system
C) It's just passing stars that are close neighbors to the Sun in the Milky Way
D) It's almost at the center of the Milky Way
E) It's already arrived at the globular cluster

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