Do anyone believe there are other beings on other planets? If so, Do you believe we have been visited?

I am a long time listener and big time fan of the Art Bell radio Show. People have came on that show talking about alien sites and being abducted. Do you believe those things are real. I never underestimate the universe. I sometimes wonder what else is out there. Alot of people think it's crazy, but think about it. Where did we really come from? who created the solar system? How was the stars made? Where did the sun come from? Why or How was the earth exactly made to be the third planet from the sun? Why are the planets in the order that they are? If there are no other life forms, Why are there any other planets? Something for the mind. I want to hear what your thoughts are. Science was my best and favorite subject in school. Got awards in that subject.