NB: Anything you see with (SN….) before it is commentary from this editor, Dr. Stephen Newdell. Emphasis with colored fonts, bold and italic type, or background color may also be blamed on me.
Science Proves Life Was No Accident!
The start of a compilation of articles edited by Dr. Stephen Newdell
Answering “The God Delusion” (which is) a video by Richard Dawkins
The Root of All Evil?, later retitled The God Delusion, is a television documentary written and presented by Richard Dawkins in which he argues that humanity would be better off without religion or belief in God.
The documentary was first broadcast in January 2006, in the form of two 45-minute episodes (excluding advertisement breaks), on Channel 4 in the UK.
Dawkins has said that the title The Root of All Evil? was not his preferred choice, but that Channel 4 had insisted on it to create controversy. The sole concession from the producers on the title was the addition of the question mark. Dawkins has stated that the notion of anything being the root of all evil is ridiculous. Dawkins’ book The God Delusion, released in September 2006, goes on to examine the topics raised in the documentary in greater detail. The documentary was rebroadcast on the More4 channel on the 25th August 2010 under the title of The God Delusion. (Wikipedia)
In this YouTube Videohttp://youtu.be/9FiHRVb_uE0 at minute 46: Mr. Dawkins declares, “Unlike religion, science doesn’t pretend to know everything. There are still deep questions about the origins of the universe that are yet to be explained. But, just because science can’t answer them right now doesn’t mean faith, tradition, revelation or an ancient text can. Science can’t disprove the existence of God. But that does not prove that God exists. There are a million things we can’t disprove.
Greatest Mysteries: How Did Life Arise on Earth?livescience.com/php/contactus/author.php
Editor’s Note: We asked several scientists from various fields what they thought were the greatest mysteries today, and then we added a few that were on our minds, too. This article is the last of 15 in LiveScience’s “Greatest Mysteries” series.
Earth is estimated to be about 4.5 billion years old, and for much of that history it has been home to life in one weird form or another.
Indeed, some scientists think life appeared the moment our planet’s environment was stable enough to support it.
The earliest evidence for life on Earth comes from fossilized mats of cyanobacteria called stromatolites in Australia that are about 3.4 billion years old. Ancient as their origins are, these bacteria (which are still around today) are already biologically complex—they have cell walls protecting their protein-producing DNA, so scientists think life must have begun much earlier, perhaps as early as 3.8 billion years ago.
But despite knowing approximately when life first appeared on Earth, scientists are still far from answering how it appeared.
“Many theories of the origin of life have been proposed, but since it’s hard to prove or disprove them, no fully accepted theory exists,” said Diana Northup, a cave biologist at the University of New Mexico.
The answer to this question would not only fill one of the largest gaps in scientists’ understanding of nature, but also would have important implications for the likelihood of finding life elsewhere in the universe.
Lots of ideas
Today, there are several competing theories for how life arose on Earth. Some question whether life began on Earth at all, asserting instead that it came from a distant world or the heart of a fallen comet or asteroid. Some even say life might have arisen here more than once.
“There may have been several origins,” said David Deamer, a biochemist at the University of California, Santa Cruz. “We usually make ‘origins’ plural just to indicate that we don’t necessarily claim there was just a single origin, but just an origin that didn’t happen to get blasted by giant [asteroid] impacts.”
Most scientists agree that life went through a period when RNA was the head-honcho molecule, guiding life through its nascent stages. According to this “RNA World” hypothesis, RNA was the crux molecule for primitive life and only took a backseat when DNA and proteins—which perform their jobs much more efficiently than RNA—developed.
“A lot of the most clever and most talented people in my field have accepted that the RNA World was not just possible, but probable,” Deamer said.
RNA is very similar to DNA, and today carries out numerous important functions in each of our cells, including acting as a transitional-molecule between DNA and protein synthesis, and functioning as an on-and-off switch for some genes.
But the RNA World hypothesis doesn’t explain how RNA itself first arose. Like DNA, RNA is a complex molecule made of repeating units of thousands of smaller molecules called nucleotides that link together in very specific, patterned ways. While there are scientists who think RNA could have arisen spontaneously on early Earth, others say the odds of such a thing happening are astronomical.
“The appearance of such a molecule, given the way chemistry functions, is incredibly improbable. It would be a once-in-a-universe long shot,” said Robert Shapiro, a chemist at New York University. “To adopt this [view], you have to believe we were incredibly lucky.”
The anthropic principle
But “astronomical” is a relative term. In his book, The God Delusion, biologist Richard Dawkins entertains another possibility, inspired by work in astronomy and physics.
Suppose, Dawkins says, the universe contains a billion billion planets (a conservative estimate, he says), then the chances that life will arise on one of them is not really so remarkable.
Furthermore, if, as some physicists say, our universe is just one of many, and each universe contained a billion billion planets, then it’s nearly a certainty that life will arise on at least one of them.
As Dawkins writes, “There may be universes whose skies have no stars: but they also have no inhabitants to notice the lack.”
Shapiro doesn’t think it’s necessary to invoke multiple universes or life-laden comets crashing into ancient Earth. Instead, he thinks life started with molecules that were smaller and less complex than RNA, which performed simple chemical reactions that eventually led to a self-sustaining system involving the formation of more complex molecules.
“If you fall back to a simpler theory, the odds aren’t astronomical anymore,” Shapiro told LiveScience.
Trying to recreate an event that happened billions of years ago is a daunting task, but many scientists believe that, like the emergence of life itself, it is still possible.
“The solution of a mystery of this magnitude is totally unpredictable,” said Freeman Dyson, a professor emeritus of physics at Princeton University in New Jersey. “It might happen next week or it might take a thousand years.”