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: Astronomers think planets formed from interstellar dust and gases that clumped together in a process called _____. 1.)stellar evolution 2.)nebular aggregation 3.)planetary accretion 4.)nuclear fusion

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taskmasters
Astronomers think planets formed from interstellar dust and gases that clumped together in a process called planetary accretion. The correct option among all the options given in the question is option "3". The word accretion actually means the formation of planets and other bodies that are created by the materials collected due to gravitational force. 
CharlesOvereem
In order to help the student expand his/her knowledge I will help answer the question. This in hope that the student will get a piece of knowledge that will help him/her through his/her homework or future tests.

Astronomers think planets formed from interstellar dust and gases that clumped together in a process called planetary accretion. Basically this process is when particles of metal and rock come together and grow into a full planet. The correct choice is

3. planetary accretion

I hope it helps, Regards.