Latest theory as to why Jupiter appears to have an anomalously small core for its size, especially when compared to the other giant planets....
http://arxiv.org/abs/1007.4722
Another Neptunian trojan asteroid discovered at the giant planet's L5 Lagrangian.
http://www.minorplanetcenter.org/mpec/K10/K10P50.html
http://www.sciencemag.org/cgi/conten...cience.1189666
http://www.naoj.org/Pressrelease/2010/08/12/index.html