With 200 to 400 billion stars in our galaxy and 100 to 200 billion galaxies in the observable universe, the odds are pretty good for extraterrestrial life to exist in locations other than the earth. In fact the odds that there is a significant amount of life somewhere else in the universe is astronomical. So the odds are that ET exists, but ET may not be as advanced as life on earth.
There is a chance that there is life within our solar system, perhaps under the surface on the moons that orbit Jupiter or Saturn. Frozen lakes on moons that have hydrothermal vents, sometimes called black smokers or fumaroles, could be the cradles for life within our solar system.
Scientists have discovered molecular compounds that are integral to life on earth throughout our universe. These compounds include amino acids containing organic compounds called iso-propyl cyanide, which is an essential building block for life on earth. This iso-propyl cyanide is also located within the Milky Way galaxy in a giant cloud about 27,000 light years away.
The fact that there may be an abundance of life within our galaxy and the universe may not answer the question: how advanced are the life forms? Some scientists believe that “abundant microbial life is a bad sign that we will never become an interstellar civilization – since these aliens would have had plenty of time to develop advanced space travel technologies, but we haven’t hears a peep from them.”
Of course, there are some who believe that aliens have been here already. In some ways, this new evidence of a universe that is a cradle for life gives credence to those who believe that extraterrestrials have been studying us for some time. Perhaps the incidents at Roswell and other locations may be true after all.