The Mystery of the Giant Planet Hidden In Our Solar System

Link to the actual article: http://m.gizmodo.com/5759865/the-mystery-of-the-giant-planet...

Note: From a fast reading of the article and the linked source, I think that they don´t have strong evidence of the existence of the "planet".

Edit: Copying a comment from 0xdeadc0de ( http://news.ycombinator.com/item?id=2219621 )

No, there’s no proof of a giant planet in the outer solar system

http://mblogs.discovermagazine.com/badastronomy/2011/02/14/n...

It's really irritating how Gawker sites detect that I'm not in America and force me to go to jp.gizmodo.com or jp.lifehacker.com, rendering the link itself entirely useless.