Helium rain on Jupiter -- SOTT Science and tech
 

scientists, using computer simulations, have found out how neon got closer to the core. Make alot of sence: Helium rain to the lower atmosphere (or liquid). Personally, if this is true, then jupiter could have become a star or experiment that failed. Anyway here is the article:

http://www.sott.net/articles/show/20...ain-on-Jupiter