The super-planet that shouldn't be there.

The super-planet that should not be there.

HD 106906 b is the newest exoplanet in the ever growing catalogue of extrasolar worlds. What's special about this one is that it throws a wrench into the planet formation theory, and leave astronomers slightly puzzled. At 20 times the distance Neptune-Sun and 650 times the Sun-Earth distance (hard to grasp those numbers, no matter what), this planet is orbiting too far from its star to exist, well, in theory. So, how it got to be there is a big question.

This is actually not the only planet whose existence is puzzling. Before that, there were these two planets orbiting Kepler 36 too close to each other (only 5 times the distance Moon-Earth), or planet WASP-17 with a surprising reverse orbit. Now, we can always fantasize about even stranger worlds out there. Why not? Say, if binary stars exist, and they do, would it be too big of a stretch to conceive the existence of binary planet systems? Anyway, what strange world would you go for if you had to pick?