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The Solar System has eight planets by the most restrictive definition of the term: the terrestrial planets Mercury, Venus, Earth, and Mars, and the giant planets Jupiter, Saturn, Uranus, and Neptune.
Earth is the only planet without a standardized scientific name used by every language. In other languages it is and was called different names (Erde in German, monde in French, terra in Latin, ge in Greek, etc.). Typically, it was called the same thing as the word for ground, although as societies became more aware of geography, geology, and ...
21 Απρ 2020 · “Planet” is a word used by the ancient Greeks to describe stars, visible to the naked eye, that moved in relation to the fixed, background stars. The word "planet" comes from the Greek word "planetes," which means "wanderer," and likely has more ancient origins.
Defining the term planet is important, because such definitions reflect our understanding of the origins, architecture, and evolution of our solar system. Over historical time, objects categorized as planets have changed. The ancient Greeks counted the Earth's Moon and Sun as planets along with Mercury, Venus, Mars, Jupiter, and Saturn.
The definition of a planet adopted by the IAU says a planet must do three things: It must orbit a star (in our cosmic neighborhood, the Sun ). It must be big enough to have enough gravity to force it into a spherical shape.
26 Ιουλ 2023 · These are Mercury, Venus, Mars, Jupiter and Saturn. And pretty much every culture knew about these five planets, which they could easily see up in the sky. They had different names for them — names that we use now in English. These come from the Roman names.
21 Μαΐ 2024 · A planet is a large object that orbits a star. To be a planet , an object must be massive enough for gravity to have squeezed it into a spherical , or round, shape,. It must also be large enough for gravity to have swept up any rocky or icy objects from its path, or orbit , around the star .
