# Probability and Common Sense Facts Pointing Out to Life Existing Outside Earth

Why should we disregard the fact that life could exist outside of this Earth? I know that proof of alien life hasn’t been easy to come up with, but thinking that intelligent life outside Earth must not exist seems like odd thinking to me. Let me explain why.

The thinking of alien life being non-existent seems similar to when humanity thought the Earth was flat or when we thought the sun was revolving around the Earth. Knowledge about those notions have evolved since then, and the same will happen regarding the concept of intelligent life outside of Earth.

I’m not even going into all the stories of witnesses ranging from military personnel, scientists, politicians and everybody else because they give us no concrete/tangible proof to work. What I believe is that a little common sense and some logic could be more than enough to arrive at the conclusion that life outside Earth should be an absolute certainty to all by now.

The question may not be if they exist but where and how to contact them.

Just knowing there are billions of suns in our galaxy alone and billions of other galaxies out there should be proof enough that there must be more thinking minds somewhere else in this universe.

In fact, scientists have come up with a scientific way of demonstrating that correctly. The Drake equation comes up with a probability of the estimate of the number of active and communicative extraterrestrial civilizations in the Milky Way galaxy alone.

The Drake equation is:

N = R * fp * ne * fl * fi * fc * L

where:

N = The number of civilizations in our galaxy with which radio communication might be possible (i.e. which are on our current past light cone);

and

R* = The average rate of star formation in our galaxy
fp = The fraction of those stars that have planets
ne = The average number of planets that can potentially support life per star that has planets
fl = The fraction of planets that could support life that develops life at some point
fi = The fraction of planets with life that go on to develop intelligent life (civilizations)
fc = The fraction of civilizations that develop a technology that releases detectable signs of their existence into space
L = The length of time for which such civilizations release detectable signals into space[11][12]

From wikipedia

According to this equation, there should probably be between 1000 and 100,000,000 civilizations in the Milky Way galaxy alone.

It may be the mathematical result of applying common sense. Besides, do you believe we made it to this point in our evolution because we’re special or something like that? We’re part of the known universe, and life is everywhere on Earth, so why would the rest of the Universe not harbor life?

We don’t even yet have a clue to what’s beyond the visible universe and have so many unanswered scientific questions. But some believe we’re alone in the universe, of which they know so little about. It makes no sense at all to me. Life should be regarded as a certainty, taking into account the universe is vaster than we know it and the fact that life on Earth is so pervasive.

The question is not if, but where, how and other intriguing ideas such as: if they exist, why aren’t they showing up? Maybe they have an agenda, or it’s we who are not ready as a species. Maybe it’s communication difficulties we might not be able to understand them. Or even maybe we’re the aliens themselves. Science has concluded the building blocks for life on Earth have an origin in comets.