The veteran Russian cosmonaut, who has flown to the International Space Station four times and has spent a whopping 736 days in space, had been speaking to Russian journalist and broadcaster Vladimir Pozner when he made the comments.
During the interview, he said he believed that there was alien life on other worlds and noted that a great number of extrasolar planets not dissimilar to our own had already been discovered.
“On top of that, we do not know about all forms of life that can exist in the universe,” he said.
Kononenko went on to note that we still know very little about what is out there in our galaxy and maintained that he does not dismiss sightings of unidentified flying objects as nonsense.
“However, I myself haven’t seen anyone, and nobody was knocking on the window from the other side to get to me,” he said.
The 56-year-old is expected to return for a fifth stint aboard the orbiting outpost next year.