Editing Planetary core (section)

===Stability and instability===
Small planetary cores may experience catastrophic energy release associated with phase changes within their cores. Ramsey (1950) found that the total energy released by such a phase change would be on the order of 10<sup>29</sup> joules; equivalent to the total energy release due to [[earthquake]]s through [[geologic time]]. Such an event could explain the [[asteroid belt]]. Such phase changes would only occur at specific mass to volume ratios, and an example of such a phase change would be the rapid formation or dissolution of a solid core component.<ref name="Ramsey 1950">{{cite journal |last=Ramsey |first=W.H. |title=On the Instability of Small Planetary Cores |journal=  Monthly Notices of the Royal Astronomical Society|volume=110 |issue=4 |date=April 1950 |pages=325–338 |doi=10.1093/mnras/110.4.325|bibcode = 1950MNRAS.110..325R |doi-access= free}}</ref>