science-junkie: A long way to go: The yellow dot shows the 200 light year radius of how far radio waves have reached into the Milky Way. (via Earth calling: Tiny yellow dot shows distance radio broadcasts to aliens have travelled)

science-junkie: A long way to go: The yellow dot shows the 200 light year radius of how far radio waves have reached into the Milky Way. (via Earth calling: Tiny yellow dot shows distance radio broadcasts to aliens have travelled)

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