Click on a box, any box. This is a pretty awesome site full of chemistry stuff. I will be using it heavily during theory development as stars are electrochemical/thermochemical, not nuclear.
For instance, during stellar evolution a brown dwarf will have differing gaseous mixtures inside it. What fractions of which molecular structures should we expect to find, given we develop probes which can sustain the pressures need to explore their interiors?
We can reverse engineer the Earth, but we must also determine which elements are where during intermediate stages as well. Reverse engineering can only go so far, something else is needed, like, actual measurements of its interior, not fake math models.