You could start this way, by just using the bullet behaviour:
system compare two values - distance(planet.x,planet.y,void.x,void.y) is less than 500
Planet - set bullet angle - angle(planet.x,planet.y,void.x,void.y)
Planet - set bullet speed - 200
Planet - set bullet acceleration - 50
From this event you can then build.
I told my dentist I had trouble with my teeth and asked her to fix it without looking in my mouth..