UNIVERSE
SOLAR SYSTEM FORMATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the process by which the solar nebula became heated during its collapse
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the period of time during which the Sun swept away all the excess material in the solar nebula
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the separation of materials in a protoplanet by density, with dense material in core
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the breakup of large objects by violent collisions with other similar-sized objects
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growth of an object by the accumulation of matter
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Detailed explanation-1: -In astrophysics, accretion is the accumulation of particles into a massive object by gravitationally attracting more matter, typically gaseous matter, in an accretion disk. Most astronomical objects, such as galaxies, stars, and planets, are formed by accretion processes.
Detailed explanation-2: -These larger objects, about the size and mass of our Moon, are called protoplanets. The accumulation of material to form planets in this way is called accretion.
Detailed explanation-3: -Accretion is the inevitable result of gravitational forces operating on all scales, and on all types of material-gas, dust, plasma, even dark matter. Gravity makes matter accrete. And when matter accretes, it forms objects.
Detailed explanation-4: -Early on, our Solar System was a disk of dust and gas in orbit around the proto-Sun. The solid materials collided with each other and accreted to form gradually larger bodies, until the Solar System’s four terrestrial planets (Mercury, Venus, Earth, and Mars) were formed.
Detailed explanation-5: -There are two widely held theories for how giant gas planets can form: core accretion and disk instability. Core accretion occurs from the collision and coagulation of solid particles into gradually larger bodies until a massive enough planetary embryo is formed (10-20 Earth masses) to accrete a gaseous envelope.