... Billions of rocky planets exist in the habitable zones around red dwarfs . ... Astronomers have estimated that there are tens of billions of such rocky worlds orbiting faint red dwarf stars in the Milky Way alone. ... A new result from the European Southern Observatoryт??s (ESO) HARPS planet finder shows that rocky planets not much bigger than Earth are common in the habitable zones around faint red stars. ... One of the planets discovered in the HARPS survey of red dwarfs is Gliese 667 Cc. ...