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Encyclopaedia Galactica

Are there alien intelligences? How could we communicate with them? What about UFOs? The answers to these questions take us to Egypt to decode ancient hieroglyphics, then to the largest radio telescope on Earth and, in the Spaceship of the Imagination, to visit other civilizations in space. What is the lifespan of a planetary civilization? Will we one day hook up with a network of civilizations in the Milky Way Galaxy?