What Is the Basic Idea Behind the Planetesimal Hypothesis

question 133

Multiple Choice

What is the basic idea behind the planetesimal hypothesis?

• A)That planets form as a direct result of the nuclear fusion of nebular gases and planetesimals.
• B)That planets form from the remains of super-giant planetesimals that undergo nuclear fission and blow apart,thereby creating smaller objects-the planets.
• C)That early in the history of the solar system,a star passed near to the Sun and pulled off gases that eventually condensed to form planets.
• D)That small grains of cosmic dust and other solids gradually accrete to form planetesimals that may grow to become protoplanets and eventually planets.

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