Why Aliens probably exist - a semi deductive argument

[goslin]

If

The conditions needed to sustain life as we know it are heat and water
-though the origin of life is still unclear
and

Water and heat are known to be present together on other planets and moons in our solar system

and

Our solar system is one in millions and billions

then

Water and heat are probably present on some planets and moons in other solar systems

and if

the process of natural selection is universal

and

human beings evolved from this process

and

are intelligent and sentient
-debatable
then

intelligent, sentient organisms could evolve on other planets

and

may have evolved to or beyond our level of technology before humans even existed

and

we manipulate genetics and build space travel technology

Then

Extra-Terrestrials may exist and may have the same or better technology than us

and because

Earth has heat, water and biological and non-biological matter that proves useful to us

and

the mythologies of several ancient and complex cultures(ex. the Sumerians) claim non-human beings came from the sky to earth to use human labour and the earths materials

then

Extra-terrestrials may/probably have been on earth at some point

The idea that human beings must be the only intelligent life, based on what we know now of the universe and even of the ever surprising organisms we share the world with, self-centered.

Probability suggests:

We are not that special.