Article of the Day: The Naked-Eye Planets

Article of the Day:
The Naked-Eye Planets

The naked-eye planets are the five planets in our solar system that can be observed without any optical aid: Mercury, Venus, Mars, Jupiter, and Saturn. The five planets closest to Earth, they were the only ones known to the ancients before the development of the telescope. Grouped together with the Sun and the Moon, they form what some cultures call the seven heavenly objects. Ancient cultures’ knowledge of the heavens can be seen in the word “planet,” which comes from a Greek term meaning what? More…: https://play.google.com/store/apps/details?id=com.tfd.mobile.TfdSearch

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