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Assuming we receive a signal from a civilization on the other side of our galaxy, a two-way conversation with them is ________.
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14 votes
14 votes
Assuming we receive a signal from a civilization on the other side of our galaxy, a two-way conversation with them is ________.

User Haonan Chen
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1 Answer

15 votes
15 votes
2 times the diameter of the galaxy?
User Yusuf Tezel
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