We are not alone in the universe!
Carl Sagan — 'The universe is a pretty big place. If it's just us, seems like an awful waste of space.'
Even Islam today accepts Angels taking 50000 years to descend from heaven and says there are many worlds whose inhabitants each believe its the only one in all of creation.
The blue planet project (if I'm remembering this correctly) states that there are 160 types of aliens.