20. What are the main characteristics of the solar system? a. Four small planets
ID: 290518 • Letter: 2
Question
20. What are the main characteristics of the solar system? a. Four small planets close to the Sun, four large planets far from the Sun, and one small planet farthest from the Sun. Three small planets close to the Sun, five large planets far from b. the Sun. c. the Sun. d. Three small planets close to the Sun, seven large planets far from Seven large planets close to the Sun, two small planets far from the Sun. The over all shape of the orbits of most planets in the Solar System is a. perfectly circular. b. parabolic. c. slightly elliptical, but nearly circular d. very elongated ellipse. 21. 22. In our solar system, which of the following is not a member of the terrestrial group? a. Venus b. Jupiter c. Mercury d. Mars 23. Which Planet was discovered in the twentieth century? a. Pluto b. Uranus c. Neptune d. CeresExplanation / Answer
20. a. Their are nine planets in our solar system. They are mercury, venus, earth, mars (four small planets) and jupitar, saturn,uranus, neptune (four large planets) and pluto (one small planet). The first four are terrestrial planets and close to the solar system. The last five are gas giants and are far from the sun.
21. c. The orbit of most of the planets of solar system is elliptical or nearly circular.
22. c. Jupitar is not a terrstrial planet. It is a gas giant primarily made up of hydrozen with one quarter of helium.
23.a. Pluto was discovered in 20th centuary Clyde Tombaugh.
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