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For example, Anaximander’s map from around 550 B.C., included only Europe, Asia and Libya, surrounded by a circular ocean.

The world is in flux said Anaximander: worlds are born, appear, and disappear.

The sun, in Anaximander’s view, was not a spherical body, but a world-girdling wheel of fire; the bright orb we see in the sky is just a hole through which we glimpse the conflagration beyond.

Since the time of the Greek philosopher Anaximander, humans have gazed up at the heavens and wondered: Is anyone else out there?

Anaximander of Miletus was a friend and colleague of Thales, one of the first people we know of to do an experiment.