The title Smallest Earth-like planet discovered is a bit strange. Okay, if you define "Earth-like" as "orbits a sun and is not a gas planet or ice lump," it might fit. But what does such a definition bring then? 5.5 times as large as Earth, the distance to the sun 3 times as far, the sun weaker than Earth's, and the temperature at minus 220 degrees - sorry, that's really not particularly Earth-like ...