In the actuallity, with all the knowledge is very difficult to dont think that there is no one more than us in the univers, in my opinión i support the idea of intelligent life in other plantets.
For example Mars has been the biggest focus of the ongoing search for life on other planets for decades, and four years ago the scientist found the posibility of wáter.Finding water on a planet is vitally important to proving that life exists there because it acts as a solvent in chemical reactions for carbon-based life.Another reason is that Mars is located in a nice zone because the distance from the Sun in which conditions are optimal for the existence of carbon-based life.
Another example of posibility of life in the universo is   Europa, it is the fourth largest moon of Jupiter and the sixth largest moon in the solar system. Europa's surface is covered with ice.
Another planetoid mentioned in connection with Life in the solar system is Titan, the largest of the moons of Saturn. Titan has an atmosphere largely made up of nitrogen, with less than one percent of methane. The surface pressure of Titan's atmosphere is higher than that of Earth, but the temperature is extremely cold.
I think than we are very close to find our partners in the univers, this moment would be one of the most important in history.