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If enough time has passed for gravitational forces to allow the formation of planetesimals(proto-planets) in orbit around the proto-star, how likely is it that two of them would collide with one another? If they do collide, would a head-on collision be more likely than a glancing collision?

What would be the observable effect of such a phenomena?

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  • $\begingroup$ How do you understand that “gravitational forces” are responsible for the formation of planetesimals? It sounds ambiguous because both star–planetesimal and planetesimal–planetesimal forces can be assumed in that statement. $\endgroup$ – Incnis Mrsi Dec 22 '20 at 19:06

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