Why the first scientist imagined the Earth floating freely in an infinite void
In short: Anaximander, a 6th-century BC Milesian, broke from myth to propose that the Earth remains stationary in space without needing any physical support. By conceptualizing the apeiron—an infinite, ageless primordial mass—he laid the groundwork for scientific cosmology, suggesting that nature is governed by rational, geometric laws rather than divine whim.
Born in Miletus around 610 BC, Anaximander was a student of Thales and a pivotal figure in the Milesian school. While his predecessor Thales famously posited water as the fundamental substance of reality, Anaximander argued that no single, perceptible element could account for the opposing forces of nature. If water were infinite, he reasoned, its cold, moist properties would have long ago overwhelmed the dry and hot, preventing the existence of a diverse world. Instead, he introduced the apeiron—an indefinite, boundless source—as the material cause of all things.
Anaximander’s most radical contribution was his mechanical model of the universe. He envisioned the Earth as a cylinder floating at the center of the cosmos, held in place by its own indifference to direction. This was a profound departure from earlier cosmogonies, such as those of Hesiod, which relied on divine intervention to maintain order. By stripping away the need for a physical foundation, he opened the door to the idea that celestial bodies could pass beneath the Earth, effectively founding the discipline of astronomy and initiating what Karl Popper described as one of the most revolutionary shifts in human thought.
His rational approach extended to meteorology and the origins of life. He attributed phenomena like thunder and lightning to mechanical interactions between air and fire, rather than the actions of gods. He also viewed the Earth as a drying remnant of a once-humid primordial mass, anticipating later theories about the transformation of matter. Though his specific placement of stars and planets was incorrect, his insistence that the universe follows a geometric, rather than monarchic, order established a framework where natural phenomena could be studied as manifestations of a single, eternal substance.
The legacy of Anaximander is filtered through the accounts of later thinkers like Aristotle and Theophrastus, as his original writings are almost entirely lost. Despite the debate over whether he was the first to use terms like archē, his influence on the trajectory of Western philosophy is undeniable. By seeking a universal principle that could create without decay, he provided a template for inquiry that physicists like Max Born would later revisit, linking the ancient concept of the apeiron to the manifestations of elementary particles in quantum mechanics.
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