io9 has a nice article summarizing the (now allegedly broken) Kepler Space Telescope's more astonishing discoveries here
Kepler's mission was to discover Earth like planets orbiting other stars in our galaxy. Among the discoveries in the above series are planets orbiting binary star systems (circumbinary planets); a planet orbiting a quadruple star system, a new type of super dense planet, inner gas giants (instead of terrestrial), two radically different planets: a gas giant and terrestrial with nearly identical orbits, and strange migration patterns. One will never be able to explain these puzzles (let alone others) using nebular hypothesis. One would have to add endless variables into already bloated theoretical models.
It is reasonable to assume that at least some of these so called planets are really transformed stars in latter stages of development. These migrate from other parts of the galaxy and a newer star captures them in her sphere (i.e. heliosphere).
It is also reasonable to assume that the universe is much older than the Big Bang model with all its fantasy variables would have one think.
When scientists scratch their heads this is a sign that their theories have failed to explain reality. They will either start adding variables (ad hoc hypothesis) or abandon the theory altogether. But abandoning theories is not as simple as it may seem. The scientific community is like any other community in this fallen and sinful world.