SCIENCE
EARTH SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the center of the gas cloud cooled
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planetesimals flattened into a rotating disk
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planetesimals collided into one another
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the sun absorbed extra gas and dust from the solar system
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Detailed explanation-1: -Dust grains build up to form planetesimals, and planetesimals merge to form protoplanets. Watch the protoplanet shown in red, it collides and merges with another protoplanet.
Detailed explanation-2: -Gas Giants (Outer Solar System) In the cold outer solar nebula, where our Sun’s gravity was weaker, much larger planetary embryos formed. The largest ones swept up other embryos, planetesimals, and nebular gas, leading to the formation of Jupiter, Saturn, Uranus, and Neptune.
Detailed explanation-3: -Over time the planetesimals continued to collide and join together, attracted by gravity. These larger objects, about the size and mass of our Moon, are called protoplanets.
Detailed explanation-4: -Dust clumps become pebbles, pebbles become larger rocks that grind together to expand. The presence of gas helps particles of solid material stick together. Some break apart, but others hold on. These are the building blocks of planets, sometimes called “planetesimals."