In all of the universe,with these millions of planets,it would be quite arrogant to believe that humans
are the only sentient beings who exist.
It's much more than that. ...estimated each galaxy contains between 100 to 400 billion stars
,.. and the observable universe has 100 billion galaxies.
Earth's galaxy, the milky way, has 300 billion stars.
Here's a photo of just a few galaxies,..each containing hundreds of billions of stars and presumably hundred of billions of solar systems.