Consider adding these elements

[PooPooP]

Sodium, chlorine, fluorine, magnesium, neon, xenon, radon, cobalt, calcium, mercury.
Also consider adding combining elements into compounds such as C2H4 and H2S

[bshapiroalbert]

Thanks for the suggestion. We don't have any plans to add new elements or materials to Universe Sandbox right now, but we likely will add some more when we get around to adding realistic stellar evolution.

We also want to add the ability to create your own materials in the future, though we don't have a timeline for that.

We don't have any plans to allow elements to combine. Simulating space and physics is fairly complex already without also simulating chemical reactions.