Yes I do. Scientists have developed trustworthy techniques to discover and analyze other planets. Plus, it would be a little selfish of us to think we live in the only solar system that exists. There may be as many as 500,000,000,000 galaxies in the universe and if each galaxy contains around 100,000,000,000 stars then thats 50,000,000,000,000,000,000,000 possible stars in the Universe! We can hardly assume that there is only ONE with planets!