But if approved, K2 will be looking at a much more diverse region of sky with a wide range of astronomical and astrophysical phenomena: planets with short orbits around cooler stars (which, if in their star's habitable zone, could still harbor water); young, still - forming proto - stars, which could provide insight into star and planet formation; and supernovae and galaxy clusters. (latimes.com)
It's a basic bias in transiting exoplanet surveys: Larger objects will produce larger changes in a star's brightness, so Kepler is more likely to detect big planets or moons.Another bias is planets with shorter orbits. (scientificamerican.com)
The gravity of first Neptune and then Jupiter gradually nudged these comets into relatively short orbits that bring them closer to the sun. (sciencenews.org)