Our galaxy has about one hundred billion stars. A new Caltech study estimates our galaxy has one hundred billion planets. A reasonable “guesstimate” is there are hundreds of billions of galaxies. The biggest galaxy known has one hundred trillion stars.
Dr. Alan Boss of the Carnegie Institution of Science estimates there may be a ‘hundred billion’ terrestrial planets in our Milky Way Galaxy, many with simple life forms. He further believes there could be thousands of ‘civilizations’ in our galaxy.
The universe probably has trillions of planets with some form of life, even if those lifeforms might be quite different from us here on planet earth. It seems absurd to think we are the only life. However the distances are so vast we may never make contact with life from other planets.