CNN Outside of Earth, intriguing ocean worlds in our solar system are of interest to astronomers as potential hubs of life. New estimates and calculations suggest that there are even more Earth-like planets and ocean worlds in our galaxy than previously known, according to new research published this week. However, astronomers at the University of British Columbia have discovered that there may be as many as 6 billion Earth-like planets across our galaxy. That means that there could be one Earth-like planet for every five sun-like stars in the galaxy. "That means less than six billion stars may have Earth-like planets in our Galaxy."