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Originally posted by davidgrouchy
Here is my own poorly formed
andwer to the Fermi paradox and aliens.
(12) Due to the limitations of light speed the only
way aliens can visit us is to beam energy signatures
to our planet. Which they have done for thousands of
years, even millions. They are called plants. In the future
when we can do it, we will be able to experience other planets
as plants ourselves. The problem is that we don't treat our
visitors very well and the word has gotten out about us.
So even our very close cousins won't come visit us
in person. "All they do is eat or burn us."
Originally posted by tauristercus
1 - We are the first on the scene or at least we are so early that there is nobody around to visit us or to try to communicate with us
Even though possible, one has to regard this particular scnario as being statistically highly unlikely. Scientific evidence indicates that life arose on this planet as early as conditions would permit, most likely within a 1.2 billion years of condensation out of the solar nebula and within 200 million years of the cessation of major bombardment of Earth by planetoids. Our star system is a Population I stellar system, i.e. it is made up elements heavier than Lithium. Population I stars are necessary for the existence of life as we know it. Without these heavier elements, it would be impossible for terrestrial type planets to form, let alone the complex organic molecules that life is constructed of. Population I stars are formed from the remnants of nova and more importantly supernova. They are necessary processes to create and disperse the heavier elements that we are made up of. It's been estimated that the amount of time required for a star to form out of an interstellar nebula is less than a million years. Given that the age of our galaxy is estimated to be 12 to 15 billion years, it is unreasonable to assume that terrestrial type planets capable of supporting life would not have formed within first several billion years of the birth of the galaxy. This would give a span of time of 10 to 13 BILLION years that no intelligent life capable of sustaining an advanced civilization occurred in our galaxy. As already mentioned, this seems a highly unlikely scenario.
The age of the Universe, unlike the aforementioned fundamental forces, does not at first glance seem to have much bearing on whether intelligence can exist in it. However, it is more closely linked than it might appear. As has been said, heavier elements are necessary for life, and elements like carbon, the basis of life as we know it, take a long time to form. In fact, supernovae are the only way that heavy elements can get distributed to places that they can be of use, but supernovae are rare. If we backtracked through the Universe’s life, we would soon (soon being a relative term, in comparison to the age of the Universe) come to a time where there are far fewer of the heavier elements than there are now, and then to a time when there are none. It seems, in fact, that it has taken this long (about 15 billion years) for supernovae to distribute enough of the various heavy elements for life to be possible. So we are really living at the earliest point that it would be possible for us to live at. The vast age of the Universe is also necessary for our existence.
The Anthropic Principle
The Anthropic Principal is based upon the idea that the universe is based upon several fundamental constants of physics; these physical constants describe the way the Universe works. But what has recently been recognized is that any minor variation in these constants would make life impossible. The fact that these constants seem to finely tuned to permit life provides a strong indication that there was design behind them; they did not just fall into place out of chance. John Wheeler, who first made this idea popular, stated, “A life-giving factor lies at the centre of the whole machinery and design of the world.”
The idea that the universe was created for mankind has been a central point of philosophy in many cultures up until the recent past. The notion that the natural world, including the cosmos, was created for man is the very bedrock of many world religions and world-views, including the Judaic, Greek, and Christian philosophies. Teleology is the study of the evidence for overall design and purpose in nature. It proposes the Universe was created for a purpose and did not randomly leap into existence. Teleology has attracted the attention of many prominent philosophers and theologians such as Augustine, Maimonides, Aquinas, Newton, and Paley, all of whom devoted much of their life to this philosophical notion.
It has only been comparatively recently, however, that there has been recognition that design may also apply to gross features of the universe. In 1937, Paul Dirac noted that the number of baryons (protons plus neutrons) in the universe is almost exactly equal to the inverse square of the gravitational constant, and to the square of the age of the universe. Dirac, later in 1961, noted that these relationships would imply a narrow age range of the universe during which time life could come forth. Stars of the right type for sustaining planets capable of supporting life can only occur during a certain narrow age range for the universe. Similarly, stars of the right type can only form within a narrow range of values for the gravitational constant. It was this latter interesting fact that led for the search and documentation of other “coincidences” that must occur simultaneously for life to exist on earth.
g. The Age of the Universe. The age of the universe determines what kind of stars exist. It took about 2 billion years for the first stars to form, and then another 10 billion years for supernovae to disperse enough heavy metals for our planets to form. Another few billion years were then necessary for solar-type stars to form and then stabilize in order to support advanced life. Therefore, if the universe were only a few billion years old, then there would not be enough heavy medals formed to produce planets such as the earth. On the other hand, if the universe were much older, then there would no longer be solar-type stars in order to support life either.
Many other potential similar relationships are currently being actively researched. However, the twenty planetary characteristics listed above would be fulfilled in much fewer than a trillionth of a trillionth of a percent of all stars. Considering that the universe only has about a trillion galaxies each of which averages one hundred billion stars, statistics argue that not even one planet would be expected by natural processes alone to harbor life. Many astronomers such as Robert Rood and James Trefil, among others, are now deciding that given the above statistical probability, it is unlikely that life, especially intelligent life, exists anywhere else in the universe.
Originally posted by Xeven
I do believe there is other life out there. If you look at all the life that has existed on earth. Only one has become intelligent enough to begin to fathom the idea of talking to other intelligent beings.
That does not play well for there being lots of intelligent life out there.
Life may indeed be abundant in the universe but intelligent life may be an aberration.
Originally posted by ratqueen
OR .... Maybe; the evidence is right in front of us and we are too blind to see and too arrogant to admit it.
Originally posted by one_man24
I think that it was just made for us to wonder at, and to show His awesomeness. But I won't be disappointed if there are other beings out there either.