AGI) Berlin - A sensational discovery was made by German and American astrophysicists who detected a planet similar to the Earth. It is 22 light years away. Professor Guillem Anglada-Escude, who teaches in Goettingen, explained that this planet is likely to contain water and possibly even life like the one we know. The new Super-Earth has a volume 4.5 times greater than that of our planet; it makes one revolution every 28 days around its own sun, which is much smaller than the Earth's. Steven Voigt, from the University of California, who made the discovery together with his colleague from Goettingen, said that the discovery of this planet makes us believe that our galaxy is full of billions of planets that are potentially inhabitable. . .

source : http://www.agi.it/english-version/world/el...been_discovered

how do you calculate all that?