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Alpha 4 and Alpha 18.1
Here are pictures I have been to lazy to post.
I've increased the size of Mercury until it's growing up to a star then decreased it again and set mass extremely low so it transformed to a gas planet. This is the result 😀.
A look at Alpha 19.4
I have an overpowered computer, and to get dense Ejecta you need to run the simulation at near real time with 10,000+ Particles.All Images I post were simulated with 19,000+ particles
Basically Just Change the Number of Non Attracting Particles to 20,000 in the settings. Then just run your collision Sim at 1 second per second.