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killian killian
wrote...
Silver Member
Posts: 6024
10 years ago
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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padrepadre
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Posts: 21610
10 years ago
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killian Author
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Silver Member
10 years ago
Thanks Padre
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