all touching particles have same life

The scripting most likely involved in creating this might make it a tad laggy, It might have to come with a label "Use sparingly"

@fireball5000

yeah i know :)

A life that decrease its size with time would be good, it would go away if people spammed it then. 

Why don't you make it yourself? Fast-Driver has a modding tool that makes it easy.

See https://powdertoy.co.uk/Discussions/Thread/View.html?Thread=15695

NEWS FLASH: stars(USUALLY, not counting stellar remnants and the like) are not solid. In addition, the only use I can think of atm is making stars(SURPRISE!) with this. However, I do kind of like the idea of a longer lasting star process because fusion "burns" through its onscreen fuel too fast for that kind of system, and the gravity idea is useful for small solar systems(chunks of dust flying around). It might be better if it was a liquid instead of a solid, but IMHO I wouldnt support this for the main TPT build. It is too limited in its usage. Would make a nice mod element though.