Read the paragraph. The tiny solar body that shares its name with a beloved Disney character, as well as being a part of our pla
netary vocabulary for over seventy years, is at the center of a discussion about how scientists define what a planet is. Although there is no concrete definition on which all astronomers agree, most believe a planet must orbit the sun and be large enough for gravity to force it into a sphere. By this definition, Pluto would be classified as a planet-the problem is, this definition also includes the multitude of other smaller bodies, like comets and asteroids, in our wide solar system. Which type of exposition is illustrated in this paragraph? Cause/Effect Contrast/Comparison Definition Classification/Division
The main topic in this passage is that of the definition of the concept of "planet." The passage states that there is still some debate about what exactly constitutes a planet. Therefore, it is not clear whether Pluto can be considered one or not, as some of its characteristics are shared with comets and asteroids.
