By now, all of your planets probably are above 4000 degrees Celsius-unrealistic even for some of the closest planets to your star especially if it's small or a brown dwarf. Also, once you're satisfied with the stability of the system, you can edit the planets not too far past their orginal parameters but also to your liking, except the temperature. if you want the planet to have an eliptical orbit but just not a hugely eliptical one, you could either not hit auto orbit and change the eccentricity of the planet's orbit lower, or do set it on auto orbit, then change the eccentrity as high as desired for the planet (or as high as you want and still maintain being in orbit, and the orbit being realistic)Īll that is needed of you now is time, keep running the simulation for as long as you want or can, and the longer it runs, the more stable your system should become, and the closer to a fully formed one. you may want to set some of your larger planets back into circular orbits, leaving the smaller ones in crazy orbits, by going to the large planets' properties, then going into "actions" and clicking on "auto orbit". after most of the colliding that can be done, has been. This has a huge effect on the most inner part of the disk but the farther out parts won't be effected as easily, just a warning. Though, when doing this, try to undo every action, meaning for every "+2% velocities" you make, press the "-2% velocities" a similar number of times, (it doesn't have to be exact, but just try to get it close) though wait a few seconds (15 to 20 should be best depending on the stellar system size, for a large one maybe more would be better) this should make orbits more eliptical (less circular) making some orbits cross (especially if you do the back and forth increase/decrease velocity thing for a long time) and therefore more collisions occur, and planets to form larger and more quickly. All the orbits are perfectly circular (see picture) and isn't realistic, and won't get you very far on having things collide and get bigger.The way I normally fix this is to play the simulation for a bit (Hopefully it's been paused this whole time, as having it unpaused makes things harder and gives different resuts) and as it plays, constantly be playing with the "+2% velocities" and "-2% velocities" buttons under powers>more. Now, until this point, you've hopefully been using auto-orbit option to place the "moons". (Note: in the picture, I only show the placement of inner solar system bodies, as I don't normally place those outer ones for the same reason I don't use large stars) In the picture below I have shown where I normally "put" my earthlike planets around brown dwarves (Only, in other types I put them in the habitable zone of the star)īut why there? Why would I put them in some arbitrary spot rather than in the habitable zone of this brown dwarf? That is because Universe Sandbox currently does not calculate habitable zones for brown dwarves, so I approximate where it might be if it did. The denser you pack these planetesimals, the greater the mass of the planet in that region will be.I typically have the most tightly packed part of the system nearest to the center, as many of these objects will be knocked out of the system or into the star/brown dwarf in a later step.Also, try to keep the number of "moons" at around 30 whrever you want an earth-sized planet, as I've noticed that most of these "moons" are about 2 moons in mass, give or take some tenths. The placement of "random moon"s will give your planets their mass as they collide and become larger. So, in conclusion to this section, I recommend using a Brown Dwarf of Red Dwarf star, and if you don't, remember to turn the luminosity of the star to zero. Also, another reason I don't tend to use larger stars is that the system in general is much larger, and so the likelihood of a collision goes down, therefore making you wait longer for things to become more stable and more like a fully-formed star system. The reason I say this is so that when you're placing your planets to form, they will actually collide and get larger instead of heating up and disappering before ever hitting anything else. I recommend using either a very low end M-class star (the smallest and reddest stars) or a brown dwarf (a very, very large gas giant, preferably above 70 Jupiters in mass) You can, technically, start out with other sized stars but I recommend that if you insist on doing so, turn realistic off, and the luminosity to zero. First, quite obviously, you will need to place a star for objects to revolve around.
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