GK
SOLAR SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They have rocky surfaces.
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They each have many moons.
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They are larger and more massive that the sun
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They have thick atmospheres of hydrogen and helium.
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Detailed explanation-1: -All of the inner planets are solid, dense, rocky planets . The inner planets either do not have moons or have just one (Earth) or two (Mars). None of the inner planets have rings.
Detailed explanation-2: -The temperature of the early solar system explains why the inner planets are rocky and the outer ones are gaseous. As the gases coalesced to form a protosun, the temperature in the solar system rose. In the inner solar system temperatures were as high as 2000 K, while in the outer solar system it was as cool as 50 K.
Detailed explanation-3: -The four inner planets have shorter orbits, slower spin, no rings, and they are made of rock and metal. The four outer planets have longer orbits and spins, a composition of gases and liquids, numerous moons, and rings. The outer planets are made of hydrogen and helium, so they are called gas giants.
Detailed explanation-4: -The four innermost planets are referred to as terrestrial planets and have characteristics like liquid heavy-metal core, at least one moon, and valleys, volcanoes, and craters. These are all Earth-like features; thus, Earth is a terrestrial planet.