I don't think it is too far off. Recently an exoplanet with a long elliptical orbit was discovered: http://www.newscientist.com/article/dn16501-elliptical-orbi

I don't think it is too far off. Recently an exoplanet with a long elliptical orbit was discovered: http://www.newscientist.com/article/dn16501-elliptical-orbit-gives-exoplanet-a-regular-roasting.html#.UzO4vRZVjPM http://www.newscientist.com/article/dn16501-elliptical-orbit... Also it could be a brown dwarf which are hard to detect but will be inline with typical binary star systems observed elsewhere. It is hardly unlikely that our own sun is an exception to the rule. Not to mention, the 'nemesis' theory is speculated by some main-stream astronomers.