Super Earth's are Pretty Common. We Just Don't Have One.

Since the discovery of the first exoplanet in 1992 astronomers have now found over 5,000 alien worlds around other stars. With the discoveries of exoplanets came an entirely new classification of worlds known as the super-Earth; terrestrial planets more massive than Earth but smaller than Neptune. Sadly we don’t have any such planets in our Solar System but a new report suggests planets like this are surprisingly common with at least as many as there are Neptune sized planets.