The five classical planets, being visible to the naked eye, have been known since ancient times and have had a significant impact on mythology, religious cosmology, and ancient astronomy. In ancient times, astronomers noted how certain lights moved across the sky in relation to the other stars. Ancient Greeks called these lights πλάνητες ἀστέρες (planetes asteres, "wandering stars") or simply πλανῆται (planētai, "wanderers"),[13] from which today's word "planet" was derived.[14][15] In ancient Greece, China, Babylon, and indeed all pre-modern civilizations,[16][17] it was almost universally believed that Earth was the center of the Universe and that all the "planets" circled the Earth. The reasons for this perception were that stars and planets appeared to revolve around the Earth each day[18] and the apparently common-sense perceptions that the Earth was solid and stable and that it was not moving but at rest.
History (planet)
The idea of planets has evolved over its history, from the divine wandering stars
of antiquity to the earthly objects of the scientific age. The concept
has expanded to include worlds not only in the Solar System, but in
hundreds of other extrasolar systems. The ambiguities inherent in
defining planets have led to much scientific controversy.
The five classical planets, being visible to the naked eye, have been known since ancient times and have had a significant impact on mythology, religious cosmology, and ancient astronomy. In ancient times, astronomers noted how certain lights moved across the sky in relation to the other stars. Ancient Greeks called these lights πλάνητες ἀστέρες (planetes asteres, "wandering stars") or simply πλανῆται (planētai, "wanderers"),[13] from which today's word "planet" was derived.[14][15] In ancient Greece, China, Babylon, and indeed all pre-modern civilizations,[16][17] it was almost universally believed that Earth was the center of the Universe and that all the "planets" circled the Earth. The reasons for this perception were that stars and planets appeared to revolve around the Earth each day[18] and the apparently common-sense perceptions that the Earth was solid and stable and that it was not moving but at rest.
The five classical planets, being visible to the naked eye, have been known since ancient times and have had a significant impact on mythology, religious cosmology, and ancient astronomy. In ancient times, astronomers noted how certain lights moved across the sky in relation to the other stars. Ancient Greeks called these lights πλάνητες ἀστέρες (planetes asteres, "wandering stars") or simply πλανῆται (planētai, "wanderers"),[13] from which today's word "planet" was derived.[14][15] In ancient Greece, China, Babylon, and indeed all pre-modern civilizations,[16][17] it was almost universally believed that Earth was the center of the Universe and that all the "planets" circled the Earth. The reasons for this perception were that stars and planets appeared to revolve around the Earth each day[18] and the apparently common-sense perceptions that the Earth was solid and stable and that it was not moving but at rest.
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