A new theory released recently suggests that planets may form similarly to how stars form.. In great dust clouds.
This theory is the first step in explaining why neptunian style planets can be found as close to their star half the earths distance from the sun.
The new theory suggests that planets are formed elsewhere and then pulled in by a stars gravity, at which point the star strips off the excess gas and reveals the planets..
I personally do not think this that plausible as I believe like many that stars and their planets are formed together.. However we shall wait and see.
A scientist never loves anything more than they love being wrong, because being wrong and knowing it means you are one step closer too the truth.
If you wish too read the full article it can be found here
www.Sciencenews.org