Are we alone? Mankind has asked this question since we first looked up into the night sky, gazing out across the endless sea of stars above. We have always wondered if there is anyone else out there, somewhere amongst the billions of stars, or if we are all alone in this vast universe. Some philosophers throughout history believed that Earth in unique, the one special planet at the center of the universe, with human beings the apex of creation. Others, however, realized that there really isn’t anything special about our planet, or our solar system, so similar life likely could have evolved elsewhere in the cosmos.

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