Ancient Greeks were aware of several planets, including Mercury, Venus, Mars, Jupiter, and Saturn, which they could observe with the naked eye. They named these planets after their gods and noted their movements against the background of stars. However, they did not know of Uranus and Neptune, as these planets are not visible without telescopes, which were not invented until much later. Thus, the ancient Greeks had knowledge of the five classical planets but were unaware of Uranus and Neptune.
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