GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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According to the nebular theory, what is the next step in the sequence of events after the immediate collapse of the interstellar cloud due to gravity?
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A flat, rotating protoplanetary disc is formed
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Planetismals collide with each other to create larger bodies
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Solar wind pushes debris to the outer regions of the universe
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Nuclear fusion begins and a star is born
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Explanation:
Detailed explanation-1: -A protostar becomes a star when nuclear fusion begins. Most likely the next step was that the nebula flattened into a disk called the Protoplanetary Disk; planets eventually formed from and in this disk.
Detailed explanation-2: -According to the nebular theory, stars form in massive and dense clouds of molecular hydrogen-giant molecular clouds (GMC). These clouds are gravitationally unstable, and matter coalesces within them to smaller denser clumps, which then rotate, collapse, and form stars.
Detailed explanation-3: -Cloud Collapse: Formation of Protoplanetary disk: Growth of planets:
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