Absolutely not. I'm confident enough on that point, may be not in our solor system but there is lots of other solor system existing out there so there is chance of it for living creatures. More than that we believe when it mentioned alians we thought its simmila to us or looks like human. But it's wrong simply a bacteria type of liveing being also considerd as alians. So 90% sure we're not alone
True Assassin a tiny virus size creature can be an align so there are more chances for aligns in the other galaxy which means we are not alone in this universe.