UNIVERSE
SOLAR STRUCTURE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Each planet is composed of materials of different densities.
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The Sun exerts a gravitational force on the planets.
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Cosmic dust settled in layers on the planets’ surfaces.
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All planets cooled rapidly after they formed.
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Detailed explanation-1: -Differentiation is the process by which gravity helps separate a planet’s interior into layers of different compositions and densities. The heavier metals sink to form a core, while the lightest minerals float to the surface to form a crust. Later, when the planet cools, this layered structure is preserved.
Detailed explanation-2: -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-3: -The clue to why the inner and outer Solar System bodies have such different sizes and composition despite forming from a common nebula lies in realizing that all this planet formation was going on at the the same time as the proto-Sun was “turning on"; the inner Solar System was much hotter than the outer Solar System.