There are many opinions and views on the existence of extraterrestrial life and UFOs in our vast universe. We might be the only intelligent beings among the billions of planets that exist in the universe?

The astronomer, teacher, and writer Jeffrey Bennett discussed a variety of ways in which the man is searching for life in the universe, including the SETI and various missions launched into space as well as the implications of extraterrestrial life presents to humanity. He highlighted three possibilities as to where was the question of extraterrestrial life (often referred to as the Fermi Paradox).

One possibility is that the intelligent civilizations are very unusual, and we are alone in the universe. Another is that these civilizations may have existed millions of years ago, but was destroyed before reaching the capability of interstellar travel.
A third possibility is that alien life is out there and there is a galactic civilization advanced, but they decided to ignore them. "That's one reason why I am skeptical about the UFO reports, because I think that if they decided we want to know, they would be very, very obvious about it," said Bennett.

Bennett hypothesized as extraterrestrial life might look like, and suggested that they probably would share profiles similar to ours, if they also had the skill to build a ship, or interstellar transport. He is enthusiastic about the Kepler Mission, which has discovered more than 1200 exoplanets and that only the first few months of data analysis. "In coming years, Kepler Mission will find thousands of planets, many of them the size of Earth, some of them in orbits similar to Earth's. So now we're just learning for the first time in history that planets like ours really exist out there, "he said.

The Cassini mission, which is currently orbiting Saturn, Bennett also impressed, particularly the landing of the Huygens probe on Titan, a moon of that planet, a feat which he likened to hit a dime with a bullet to 3000 miles away. He advocates the creation of international efforts in space exploration and the Moon, not only for budgetary reasons, but to demonstrate a cooperative spirit among citizens of various nations, who often fight among themselves.

Alien life
According to Wikipedia, extraterrestrial life is defined as life that does not originate from Earth. These hypothetical forms of life range from simple bacteria to more complex beings than us humans. 

The development and testing of the hypothesis of extraterrestrial life is known as exobiology or astrobiology. The term astrobiology includes the study of life on Earth, viewed in context astronomical. Many scientists consider extraterrestrial life plausible, but there is no conclusive evidence of its existence. Since the mid-twentieth century, there has been an effort to look for signs of extraterrestrial life, ranging from radios used to detect possible extraterrestrial signals, even used telescopes to search for extrasolar planets potentially habitable. This has also had a huge role in the work of science fiction.