There may be billions more alien life-forms than the 57 species catalogued by top secret government projects...out there in space, but none of them can be developed enough to have built spaceships and travelled to Earth. Despite what the Disclosure Project participants are willing to swear to, it must be noted that astronomers offer different opinions. Astronomers know that it so difficult for intelligent civilizations to populate other planets that it is illogical to conclude that Unidentified Flying Objects are spaceships - without INCONTROVERTIBLE evidence.
There are multiple reasons why intelligent life exists here on Earth: each one necessary, each one dependent on the previous. Hence, the degree of difficulty increases geometrically that similar conditions can exist elsewhere in the Universe. We are an absolute miracle!
Take the timeline for the Human Body as a case in point.
Zinc, which you ate this morning in your breakfast cereal, is needed by the brain to generate electrochemical pulses that generate thoughts, and cause muscles to move. But how did it get on Earth?
Zinc, a heavy metal, could only have been formed by a supernova explosion. There's nothing else hot enough out there to fuse it. But when? The answer to that question points the way toward a TIMELINE for the human body, a timeline that stretches back to the beginning of the Uiverse, making it impossible for aliens to have a head start on us. It means that we got here as soon as was temporally possible. Let's that a quick look....
The Sun, by all good estimates, is about 5 Billion years old. The nebula from which the Sun was formed had to ALREADY contain the zinc you ate this morning, because the Earth was formed out of the same nebular cloud as the Sun, and thereby acquired the zinc from the nebula. But how did the zinc get in the Solar nebula?
Nebulae accrete gradually in space. It may have taken a billion years for the Solar nebula to form. Add that to the life of the Sun, and already we are back in time 6 Billion years ago - and the Universe is only 13.7 Billion years old by best estimates.
Supernovae, however, do not explode until the star reaches the terminus of its existence. So, the Sun had a mother star, that went supernova, and created the zinc you ate this morning. But how long did it take the Sun's mother star to form, and then, how long did the mother star shine before exploding as a supernova? The process of acquiring nebulaic material to form the Sun's mother star may have taken a billion years, and it may have shone for another billion years before going supernova, making that zinc you ingested this morning. So now we are back at least 8 Billion years ago....
But the Sun is a THIRD GENERATION star! That means that the Sun's mother star, because it went supernova, had to have been composed of nebular material that was already enriched beyond the stage of simple hydrogen. In other words, the Sun's mother star was dependent on material from a previous star.... Immediately we are pushed back in time to the origin of the Universe's VERY FIRST STARS. Such is the timeline of the human body. Nobody could have started any sooner!
However, we are on a PLANET, around a single yellow star. It turns out that multiple star systems (which comprise 80% of the galaxy's stars) cannot hold stable planetary orbits. So, therefore, only 20% of all stars can support planets with ANY life on them! But out of that 20% which are single stars...only yellow stars burn steadily enough to allow life to evolve on one of its planets - and only 20% of all stars are yellow! So, we have a lot less places where intelligent life can develop, and the formation of that place must have begun right at the beginning of the Universe.
Yet, the planet cannot be too far away from its single yellow star, nor too near. The "just right" zone happens to be the approximate whereabouts of LIQUID WATER. This habitable zone must harbor a planet that is not too big, nor too small: the planet ITSELF must also be "just right".
If the planet is too big, the gravity will be so strong that plate techtonics will not occur. Plate techtonics are essential for the development of intelligent life. The INGREDIENTS for life (and for the development of advanced civiliations) must be mixed throughout the crustal surface - a process that occurs only through plate techtonics.
If the planet is too small it won't have enough gravity to contain an atmosphere capable of protecting its life forms from the harmful radiation of its single yellow star. This is the case with our planets Mercury and Mars. A planet must also have a magnetosphere to block the host star's solar wind - otherwise, NO LIFE.
We have not even gotten to arguments from the fields of Chemistry, Geology or Biology, all of which add increased levels of improbability. From ASTRONOMY alone, without even considering the role the Moon plays in sustaining life on Earth, we must realize that WE are here thanks to a series of incredibly improbable events.
Was it Luck? Fortune? Or Fate?
Until the proponents of alien visitations actually produce verifiable, and INCONTROVERTIBLE, evidence to support their claims, it is illogical, in the face of overwhelming astronomical evidence ALONE, to make the leap into belief in alien visitation.