A billion years in the future…
“Our ancestors built an empire which reached to the stars,” said Alvin, his voice ringing through the Council. “Men came and went at will among all of those worlds – and now we hide like cowards behind the walls of our city. Shall I tell you why? It is because we are afraid – afraid of something that happened at eh beginning of history – because half a billion years ago the Invaders drove us back to Earth.” 

Arthur C. Clarke, 1954

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