NASA's Kepler telescope has now identified an insane 2,326 possible exoplanets. What's particularly shocking is how many of these planets are giant rocky planets known as Super-Earths, which defies everything we thought we knew about planet formation.
All planets are vast clumps of dust and gas packed together by gravity. If there's lots of material, a gas giant is the result. If there isn't much material, you get a rocky planet. At least, that's what we thought.