Panspermia
...debating. Many explanations, including creationism and mere coincidence, have been offered to explain how or why the universe and life were created, but the idea that Earth was seeded from space seems a more probable mix of many probable theories. Panspermia, first mentioned in 5th century BCE by Greek philosopher Anaxagoras, and meaning “seeds everywhere” (Crick, 1982), is a theory that integrates the theories of the Big Bang, chemical evolution, and terrestrial as well as extraterrestrial evolution. Directed panspermia, is a theory by Francis Crick, stating that life was seeded here not accidentally, but purposefully by another race. The theories of panspermia are becoming even more probable with increasing scientific evidence of life having the possibility of originating in space.
In order to understand how life could have originated at all, one must first look at how the universe was formed. A very popular theory, and one that is the basis of panspermia, is the theory that the universe was created in a giant explosion, otherwise known as the Big Bang. The approximation of the age of the universe is anywhere from seven to fifteen billion years old, with about 10 billion years old being commonly accepted (Crick, 1982). At that time, the entire contents of the universe may have been contained in an extremely small area, making it extremely dense and hot. This “fireball” (Crick, 1982) was a mixture of quickly reacting matter and radiation under extreme conditions, causing it to expand very rapidly. At first, the extreme temperatures (about one hundred billion degrees) were too hot to allow atoms or their complex nuclei to exist, but as the universe expanded and cooled, atoms could be formed and for millions of years later the rapid expansion and cooling allowed the matter to condense to form stars and galaxies. Clouds of gas in the universe were the first forms...
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