If memory serves, it wasn't just the message from Arecibo that was important, but also the magnitude of the signal itself. For a moment, Earth was the brightest object in the entire galaxy.
With such a loud signal, it shouldn't be long before our neighbors show up and ask us to please keep it down.
With such a loud signal, it shouldn't be long before our neighbors show up and ask us to please keep it down.
No? Well, have you ever tried to iron an elephant?