If you're going to call aliens, use this number
It's like the cosmic Rosetta Stone. What makes 21 cm radiation perfect for long-distance interstellar chats is its ability to ...
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Episode Transcript – Episode 33 - Rosetta Stone
It was in these volatile circumstances that Ptolemy V issued the Rosetta Stone, and others like it. The Stone is not unique; there are another 17 similar inscriptions quite like it, all in three ...