Have u heard of Gliese 581c, and 581d? this are Earthlike planets.?

In 2007 European Astronomers discovered planets Gliese 581c and 581d in the same solar system on the constelation of Libra. The planets are around 20 lightyears away form us. Astronomers thought 581c was capable of sustaining life, but further studies revealed that it was doubtful that life could exist in this planet and that 581d had better chances of supporting life. They're not sure yet but they are still making calculations and would like for some day to be able to visit this planet.. So if they prove this planet or planets to be Earthlike with water and everything, that would mean that there's millions of planets like ours, because they've found two candidates and that is just in our galaxy and there's millions of galaxies out there in the "known univerese", so would u still think that Earth is the only planet in the Universe sustaining life?..