Planet ejection

[topito2]

It is said that high massive planets can eject small planets in planetary forming systems. I don't understand that since gravitation is supposed to attrack things. Do you know of any article that expains that kind of phenomenum?

[tony873004]

It attracts it, then the smaller planet, not having collided escapes with the same speed relative to the planet, but a new direction which puts it on an escape trajectory. See the explanations in the thread:

Mission To Pluto Uses Jupiter To Speed Up?

[topito2]

I'll check it out. Thanks.