The planets so far discovered across the Milky Way are a motley, teeming multitude: hot Jupiters, gas giants, small, rocky worlds and mysterious planets larger than Earth and smaller than Neptune. As we prepare to add many thousands more to the thousands found already, the search goes on for evidence of life– and for a world something like our own.
Source: Rocky? Habitable? Sizing up a Galaxy of Planets
This fascinating article appears on the NASA website. For readers and fellow writers, it’s well worth your attention