Are we the only ones in the universe?

Do you believe in aliens?. The existence of Aliens has been an interesting topic to talk about for the past 50 years, and even though the government try to hide the evidence of their existence. A lot of people over the US have seen circular objects flying around the sky, and they said that it had to be a spaceship for their shape, and for the way the object flew. In my opinion, Aliens exists, and they are checking us out every single day. The universe is huge, and If we live in this small planet, why they cannot exist in another one?.