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Study with Quizlet and memorize flashcards containing terms like Terrestrial, What is a planet?, Planetary Motion and more.
- What is a Planet? Flashcards
a natural or man-made object found permanently in the...
- What is a Planet? Flashcards
a natural or man-made object found permanently in the celestial sphere, example of celestial bodies include planets, starts, asteroids, and man-made satellites
"What is a Planet? Study with Quizlet and memorize flashcards containing terms like planet, Kuiper Belt, discovery and more.
The planets Mercury, Venus, Earth, and Mars, are called terrestrial because they have a compact, rocky surface like Earth's terra firma. The terrestrial planets are the four innermost planets in the solar system.
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.
27 Ιουν 2019 · What Is a Planet? The Short Answer: A planet must do three things: it must orbit a star, it must be big enough to have enough gravity to force a spherical shape, and it must be big enough that its gravity cleared away any objects of a similar size near its orbit. This cosmic cloud, called Sharpless 2-106, is an area where stars (and planets) form.
One idea is to simply define a planet as a natural object in space that is massive enough for gravity to make it approximately spherical. But some scientists objected that this simple definition does not take into account what degree of measurable roundness is needed for an object to be considered round.
